Just too short; otherwise, not a bad game.
The main problem is that there are only seven missions in the single player campaign, which is way, WAY too short. Should have been 10.
The graphics are good, but not trend-setting. very similar to other RB 6 games.
There is a mission generator, where you can set up your own levels. Very similar to previous games, although it would have been nice to see them include every map from previous RB 6 games. I don't think that would have been too difficult.
Critical Hour seems to have a more serious feel to it than Lockdown...less arcade, more tactical.
Also, it would be nice if you could create your own character rather than always use Chavez etc. There is definitely a move in the video game industry to eliminate customization.
Otherwise, very standard RB 6 game. If you're a fan of RB 6 games, and don't mind paying extra for a game that is too short, you'll like Critical Hour.