I don't remember having any problems playing the game. If you want unplayable buggy go and try out spellforce 3,it is real shame. Great game but unplayable because of the bugs.
spellforce 3 doesn't look appealing.
as for grotesque tactics, i don't know how long it's been since i tried to play it so maybe we played different versions and it got patched. all i know is that is was so broken i couldn't progress with the main quest at the time.
Spellforce 3 is competing with ELEX for the best rpg of the year for me. Certainly the best writing in the past few years,far above PoE,DOS or the millions of words Numenera. Anyway i played Grotesque tactics 1 and 2 years ago and still remember it strangely. I never had any problems with both games,but you know how PC gaming is,some people are lucky and some are not with the bugs.