I picked up the complete pack (apart from The Druids) in a Steam sale quite some time ago , but only began playing a few days ago. So far, I've played for roughly 2 hours and encountered no crashes or bugs whatsoever. At the moment, I'm still in the learning phase for the game, but I must say that I'm impressed! The subtle blend of RTS, RPG, adventure, turn based strategy and story driven gameplay works well together. The game never seems to grab you by the scruff of the neck and force you down a linear plot line. It, rather, places the choices before you and lets you take the path you see fit. The RPG and adventure elements, for me, seem to harken back to the days of "choose your own adventure" books. This may seem like a strange comparison, but you'll see what I mean if you play it.
In all, I'd say that from what I've seen so far, I'd highly reccommend this game. Especially if you enjoy the Total War series and fancy something with a mythical fantasy setting.