Simply sublime. One of the greatest story-driven games that's been made, and as a series it's a wonderful example of a truly brilliant saga that actually makes you care about the characters within it. If you've not played Mass Effect, you are doing something wrong.

Brilliant, captures the feel of the classic XCOM game yet modernises and streamlines without dumbing down too much. Addictive and great replay value, can't recommend it enough.

Worth getting purely for the glorious execution moves. Take that away, though, and it's still a bloody fun game, given excellent longevity by the coop invasion-style mode as well.