Feelin' a little doom-and-gloom about the bugs in 2.5, which are pretty damn miniscule in the grand scheme of bugs and glitches. "Glitchy as diddly" isn't quite how I would personally describe it. Not by a long shot.
I mean, nothing's been found (to my knowledge) that breaks the game, or crashes it, or anything that actually harms the experience more than minor cosmetic screwups (of which there are few). I'm pretty sure 1.5 has a random quit-to-title problem. The game's fine 9 times out of 10. Looks good, sounds good, plays good.
Certainly not on the level of other recent releases, like the already-posted AssCreed Unity, which beyond the missing faces has NPCs pop in and out of existence, falling through the world, framerates dropping on all platforms, etc.