Hmm, 25-30 seems ok, as long as that gives us enough points to actually spec our character.
eg, in the witcher 2, the level cap was 35, which SEEMS high, but it only lets you explore about 1/4th of the full tree. (which some people claim as genious for allowing you to fully choose your playstyle, but I just see as frustrating. Also, you had to play 3/4th of the game while never really having a satisfying/tactical character build.)
In DAII, I could make a character decent after already level 10. And further levels just piled on. That was great!
I hope they do the same in DAI.