Awakening had a respec thing, and you could get mods to respec in origins. I hope DA2 has respec, since I like playing around with all the abilities to find what combos work good for me.
As for tanks in DA1, absolutely awesome by the end of the game. You can keep hate, buff allies, kill shit and you take barely any damage with the right armour. The only issues I had were stamina ones, keeping all those sustained abilities active left very little for things like Assault etc. I can't remember specifically, but you usually have some points left over for some cross skills, though you'll likely never use them. Between main skill tree, specialization and class tree, there isn't a lot for hybrids.
EDIT:
Just finished the demo, I'm liking it a lot. I can't wait for mods and expansions to start rolling out. Also, do mage AoEs not hurt allies? That's the one thing I hated about mages, but if that's not the case... then I might just roll mage for my first run.
XI Wiki



