You can get some utility, but since casting spells consumes the same AP as attacking or whatever, you're not really doing much by having hybrids versus having mages specialized in doing these things using their full AP doing it and specialized other chars doing their own thing. Stats can also be an issue, although I've found with leadership aura you can ignore your main stat a good amount. Main stat mostly only affects your chance to hit, and leadership gives 15% at max level, which makes it hard to miss on anything even with relatively low main stat(like say 11-13 or so, including items), which then lets you get some decent int to cast some novice and possibly adept spells.
You can also get acceptable strength as a rogue, since you get 4str from dual wield crafted daggers, which lets you use some baseline stuff like Battering Ram for movement(and a chance to knockdown, even if pretty low) or Encourage for buffing if you don't have a warrior doing it. Then there's melee power stance for 20% damage and the chance to hit penalty is negated by the backstab trait.
That said, hybrid stuff tend to be something for lategame. You can't really start as an hybrid and do very well. You can however, once you reach say 15+, start grabbing other stuff if it makes sense, as it becomes easier to get the required stats, and you're probably having useless ability points anyway if you're not a mage.