Just because stuff is resistant to frost doesn't mean it's completely unusable. Besides, a Master Vampire would never use ONLY frost magic in any given situation...they're smarted than that. Branch out a little bit, use Lightning when something is resistant to frost, or let your thrall minions (Conjuration) do the work for you in situations where frost can't be used. When roleplaying, you have to have imagination. If you were a master vampire, how would you approach a given situation with the cards you're dealt? You wouldn't try to freeze something that can't be frozen, you'd figure out a work around.
There's plenty of lore/RP friendly ways to get around your dilemma, I don't see a reason to quit over anything you've described, OP.
Similar obstacles can be met in real life, would you then blame god for screwing your RL experience?
Thanks alot, really. I dont even use destruction that frequent, I only use it when im swarmed by enemies or need range, when im searching for some extra kick to get me out of trouble and because im a vampire and according to lore I thought ice would be great for role play, it just doesnt have much kick. Illusion is really my forte because there is very little it cant solve. But the things it cant solve are the things that will kill me dead in a heartbeat, in which case I need distance attacks you see.. But I guess I have to sacrifice some perks and branch out into lightning. Maybe I wont help in the civil war at all, Idk...