The +2 int has equated to about 10 damage on my absolute strongest spell, and there's a talent that gives +2 stats if it's truly that important. The stats are a nice little boost, but they're about what you'd find on an enchanted piece of equipment in Act I. So far, they have yet to be decisive for me (My favorite playthrough so far has been a human wizard and a lizard battlemage duo), and I've beaten act I several times. Elf wizards are baller, so feel free to make one!