I like rolling characters with a random element. I guess that's my P&P background coming out!
I find it makes item hunting more interesting, eg when one of your characters that rolled a poor score finds an item that counters it. For example, in D&D the Gauntlets of Ogre Strength can be a godsend for fighters that rolled less than 18 strength, but if you can just select 18 at character creation you don't need it as much (except for non-fighters of course).
It's too early for me to say whether it is well handled in Grimoire (i haven't been able to play it since Saturday….) but random attribute rolls definitely don't concern me in principle.