: The temptation is growing to fire up H2A but at the same time I don't want my
: experience tarnished by bugs (including the achievement unlock ones)

: I've browsed the waypoint and gamefaqs forums but they are all
: (understandably) still aggro about the state of matchmaking and the launch
: in general so I fogured I'd post here instead :)

: Have you come across any particularly bad bugs during your H2A runthrough or
: has it been solid enough that any issues can be ignored? Also have you
: noticed any issues with the achievements?
I have a few achievements from launch day that are still bugged, but every achievement since has popped fine.

The friendly AI in Halo 2 seems bugged. Numerous times throughout the game the friendly AI refused to follow me. It's been a long time since I last played through the H2 campaign, but I don't remember ever having this much trouble. It certainly made some encounters rather troublesome.

In Halo 4 I ran into a strange bug where the game seemed to think I was in co-op... with myself. I got the co-op achievements for it, but I had to play through the level again to get credit for solo-ing it on Legendary.