Great game just for something a bit different...
It is fun, challenging, has plenty of achievements and hoards of unlockable content. There are some pretty interesting features too, including various ways to target and intercept enemies, as well as impressive moves you can pull off and watch in the replays.
Although the ground may look ugly up close it doesn't really matter as you barely get close enough to tell - apart from this, the graphics really are impressive. The planes and scenery all look fantastic.
The campaign mode is set out very well, playing through on the basic difficulty will give you the chance to familiarise yourself with the controls while it sets the basics for the different types of challenge you will face. There is a great deal of replayability value with challenges becoming tougher and various ranks and achievements that you can only get on playing the game more than once.