You know, Bob (can I call you Bob?), these are all very valid points, but you might have more of a leg to stand on when it comes to politeness if you hadn't called me quite a few names in your videos for thinking that Scott Pilgrim and The Expendable were both entertaining but flawed and questioned my intelligence for holding the opinion that Sucker Punch was an empty, over-indulgent, style-over-substance bore-fest. I believe you've also made some rather impolite insinuations about anyone who thought the protagonist of Infamous maybe had a reason to be pissed off at all the people trying to manipulate and/or shoot him (seriously, you've still never explained that one). And yes, those were personal attacks because you chose to phrase them as such. If you want a polite response, limit your criticism to the movie itself, not the people who liked it.
Honestly, I'm not surprised critics get so many rude responses given how rude and thoughtless they often are themselves. For example, I liked the film Drive Angry. If I had read Roger Ebert's review of it before seeing the movie, I wouldn't want to respectfully disagree with him, I'd want to punch him in the face. That's not because he expressed an opinion different from mine, it's because he went out of his way to ruin memorable scenes from the film that were supposed to come as surprises with no warning. This has become common practice for critics discussing something they don't like. I don't see why anyone would expect respectful disagreement if they're the one who starts the disrespect and name-calling.