Limiting what your character can do is the very point of classes - that's because, unlike Oblivion where you play by yourself, you are meant to play with a party. One of ways to encourage teamplay is to give various teammembers different elements that they need to combine to succeed. As such holy trinity was born (tank, DPS, healer) and D&D works like that. By choosing class, you choose what set of skills you want tyour character to have and you fill missing pieces with teammates.
that's unforgivable nerfing.. i'm playing alone, a single player, in a single-player mode. no one cares about how strongly powerful my pretend character is if its in god-mode or not...
why do i have to play with a party ?? why cant i lone wolf it.. because i'm nerfed. they make you exceptionally weak so you need the help of other weak npcs, then give you the false feeling of overcoming the odds, when you have 4 weaklings together..