It can be a fun game but it does have plenty of issues:
-Unskipable cut scenes
-Buggs, especially with the camera angle
-Terrible Checkpoint system
-No online co op, and when you do play co op, your friend won't earn any achievements as you can't sign in another profile.
-TERRIBLE checkpoint system
-No Space wolves, Black Templars, Dark Angels etc, only 7 chapters to choose from and there are some BIG ones missing.
-No chaplains, Apothecaries, scouts, terminators (ok terminators would be too easy, but would be good for an end game bonus or something)
-The librarian is almost identical to the vanguard, they should be more powerful at range.