Ragsnstitches said:
It's a pretty long post, so I'll be brief.
While it's true that you can always look things up in a dictionary (I'm not a walking dictionary either), people (or companies, or entities) often change the meaning of words over time, or use them differently than a dictionary states. In many cases, the dictionary often ends up eventually defining the word based on how it's used in society, and not the other way around (society adapting a word that is introduced in a dictionary).
Take in the case of standards, which we just discussed. Sure, standards might in some cases meaning an "average", but nowadays the word is also used to describe basic functionality, features or a set of described specifications/requirements that a product og piece of a product needs to adhere to. An example is the new "Ultrabooks" (thin laptops), which adheres to standards set by Intel, standards which in this case aren't a product of an average. You decided to bold/underline 'average' when you pulled up your definition. I would rather that you had bolded the word before it ('or'). Since games comes with a variety of gameplay, even within the same genre (two First Person Shooter games are still rarely the same) and appeal to different people, comparing them directly (and by that extension, trying to figure out what the 'average' gameplay is) looks like a futile effort in my eyes
In the case of reviewer versus critic, i guess it's the same. Some people like to use the dictionary, some people is going to point out that in a different language (for example, their own) there might actually be a dictionary distinction between their own version of the two words which they then carry over to english, even if the english dictionary set the two as synonyms

) - Personally, i reject the idea of using synonyms except if there are special grammatical or linguistic reasons to do so, and in most other forums I'm arguing with people, they seem to adhere to the same (unwritten) definition of the difference between a reviewer and a critic. With that said, i of course cannot fault you for it. It's just how i seperate the two. Take it or leave it
As for this...
You only described one aspect of criticism, that is, the deconstruction of a subjects faults. But omitting the merits, again, only offers the person, who you're selling your criticism to, a portion of the overall image in the game...
...like i said, i don't consider a critic to be a reviewer. In my eyes, the job of a critic is not to explain anything to a customer. It's to explain things to the CREATOR. The critisize his work and explain what needs changing.
Now, you obviously made a very good point by pointing out that even critique can be subjective. My response to this is to point out once again that as a critic,
your critique stays the most objective by pointing out what is missing rather than what is there. Take StarCraft II for example. Some people believe StarCraft II has amazing graphics, some believe it's fairly mediocre. No matter my own opinion of that, as a critic i can still point out that the game is missing an ingame anti-aliasing setting (AA in SC2 has to be enforced through drivers, which isn't optimal). I'm not judging how much it affects the graphics, I'm simply pointing out that it's missing.
Now this can become more tricky with gameplay, but since you mentioned combat (or more specifically, "Crap Melee"), there are in fact ways to look at that in a more scientific manner. Now, whether or not combat is enjoyable is subjective, but as a critic i can still point out if the combat has, say, problems with the difficulty level. For example, if the amount of deaths or the completion time of the game is very similar between newbies and veteran gamers, that points to problems, like for example player skill not having a big impact, either because the amount of options you have in combat is too limited to make any real decisions, or because the difficulty is 'punishing' instead of 'hard'.
It's worth noting that as a critic, it's not my job to tell which of the two options (limited real decisions or punishing difficulty) that is the culprit. That is up for interpretation, and the only way to figure it out is by trial and error. Like i said, perfection doesn't exist, so i can't exactly tell which one needs tuning and in which direction and by how much. All i can do is point out that the difficulty has problems. If the game doesn't have a difficulty setting (either selected actively, or intelligently based on the players performance, a bit like the AI Director in Left 4 Dead), that's also a fault i can point out, since this objectively means that either newbies or veterans will feel left out.
Then there are the more subjective issues, which i as a critic will avoid touching. These are for example single player cheats, and whether or not they belong in a game. Some people like using cheats if they find the difficulty too much or just for giggles, but some people would perhaps use cheats but later feel that they've 'cheated' themselves on the first play-through, and regret it (and wish the game hadn't allowed them to cheat in the first place). It's an interesting debate, but as long as it's a debate, it's not appropriate critic material.
Finally...
If your calling these alternative opinions wrong, or dismissing them as biased, then you yourself, are too biased to be a decent critic.
...I'm not calling ANY opinion wrong. All opinions are right when they're presented for the right people, typically meaning people with a similar mindset (to avoid using the word "fetish" since it seemed to be inappropriate/misplaced earlier. My apologies for that btw).
There is, however, nothing wrong with noting that they're biased.
Now, you shouldn't dismiss people simple because they're biased - after all, every opinion in the world is biased - but it's always worth pointing it out (especially if it's a religious debate, and you are arguing with believers. It always amuses me).