I raged so hard at how they chose to do the ending, it just felt rushed and half-arsed.
Other than that it was a pretty enjoyable game, it reminded me of Mass Effect in some respects. I'd be quite happy to buy another game in the series were they to make one, but hopefully with larger environments and more side quests next time.
The boss fights annoyed me possibly even more than the Metal Gear Solid ones, but thankfully there were only three.