The whole gameplay is casualised in TES ... in Skyrim even more than in Oblivion.
Almost nothing is absolute, you can change/reskill/etc. the whole time ... you even can adjust the difficulty EVERY TIME (even in battles).
It's all done to prevent people from whining about "oh, my build isn't great ... I wish I could redo it" (yes, you can ... start a new character FFS!). But by doing it, everything becomes even more meaningless.
No classes, no start-attributes, start-skill-advantages are meaningless, race is meaningless, ... and only 3 pseudo-attributes, where it's almost impossible to really screw up.
It's probably cool for 12 year olds, who just want to kill some time, but it's really boring for players, who want to develop/design a character. It's especially sad, because the TES leveling system does not even allow you to be and build the character YOU want ... no, you have to adjust your playstyle to the system to get the skills you want.
Oh ... the perks, yes yes, the perks, ...
You get so many perk points to spend, and there are so many useless perks, that in the end, every character can do almost everything anyways.
It's really hard to screw something up here. Some people might like that, but to me I just can't enjoy making a "good build", if I wasn't able to make a "bad one" in the first place.
I wasn't going to take part in this thread, but I had to respond to this.
I'm not 12. I'm 28. I am an Elder Scrolls vet since Morrowind. I play these games not to kill time, but to design new and unique characters, and develop them and their stories.
I can do that in Skyrim just as well, if not better, than I ever could before. That's why I love Skyrim so much, because I've been given more control and more customization options than what I had before to make a truly unique character all of my own vision.
I am not "forced"to play to a certain style. Never have been.
As far as perks go, considering that you can only get about 50 perks, out of a possible 250 or so, I'd say no, it's not possible for all characters to do mostly everything. Your max amount of perks you can get is 81, and that's if you max every skill to 100. And even by maxing every skill to 100, 81 perks is not nearly enough to master everything.
That's actually more a result of the Morrowind / Oblivion leveling system that let you become great at everything.