Variance in Quality

[Crastin]

I played Assassins Creed from Ubisoft and I can't put that game down, it's just amazing. Then, recently I picked up Beowulv from Ubisoft as well and it's a complete piece of trash. What gives? I know Beowulv is based off the movie and it probably had more constraints etc but i'd like to understand exactly what is different in the design process of different titles from the same company and why they turn out so completely different.