Honestly I think there are too few options in Skyrim, it feels like we get less and less options every game.
I like the idea of the facial sliders, but my problem is that it's very hard to tell what something is going to look like when it's actually displayed in game. My major fem-shep character in Mass Effect has mutant cheekbones I can't fix (but I guess give her character) despite looking good when I first worked the sliders.
That said, I think the complaints here are kind of ridiculous overall... other than how they should perhaps put combat and non-combat skills into differant catagories.
As far as being leveling themselves into a corner... well I could argue that a game that has no chance of really losing is kind of boring, I'd consider getting stuck this way a "defeated" condition for the game.... especially seeing as part of the fun is that you have so many options that you should be able to find a way to make any kind of character work to an extent.
Case in point, if your weapon and shield character is stuck, perhaps you should do a differant character or go back to a pre-dungeon save, and work on adapting your character. Elemental resistances on equipment help, as do summoning your own monsters. Not to mention bringing a follower along... especially one that can ALSO summon monsters can be a big help. Also having the right weapons making a big deal, not only in termsof making them youself, but getting your hands on some of those Daedric artifacts helps a lot. Spellbreaker in paticular is a HUGE help if your a weapon and shield character. The Sanguine Rose is arguably an "I win" button for most fights because with a few charged soul gems to recharge it if you need to you can just hide and summon Dremoras one at a time to wear down the enemies.
Also for the record if you were paying attention that "mangy dog" was not just a dog, it was part of the divine powers of a Daedra Lord... so you know... being invincible sort of makes sense.
All NPCs that join you are also invincible, or supposed to be. If they are defeated by an NPC they are supposed to be knocked down and will get back up after a few (even re-entering a fight). The thing is that your supposed to have the option to kill your followers (and it's something you do for a few paticularly evil quests), so you can deathblow them. If you find your followers dying in combat it's either due to a glitch or you accidently taking them down with splash damage or missing an attack.
At any rate if your having trouble I recommend grabbing an NPC, gearing them as well as posisble and giving them some nasty staffs for spells like fireball, blizzard, summon storm atronach (you can manufacture this with the Forge beneath Winterhold), and other things. You wind up being immune to their splash damage. Then start tough fights by summoning your own minion (a storm atronach or a dremora from The Sanguine Rose.. SA book can also be made at the same forge). You can wind up with a party of a dog (buy Vigilance if need be), a minion (I like Eola, the cannibal high-priestess of Namira), and two summoned monsters all going at the same time. If you hit 100 in conjuring you can have three summoned monsters going at the same time and well... yeah... big mess. I don't have 100 conjuring right now though.
The point is that there is some strategy and tactics involved, and that's what can make things hard or easy.