Boring combat, linear map design, lack of freedom in choosing a hero, preset artifacts, useless shops, no need to hire other heroes, stupid opponent AI, mostly crappy character redesign, poor voice acting, probably the worst narrator ever, bugs, bugs, bugs.
Add the fact, that 90% of the missions are ridiculously easy and the rest is only a tad hard and you've got yourself a disappointment of the year, assuming you loved the second installment like me.
And why add critical...