I gave this game a second chance, and so should you.
As I started to play the game again, i noticed that I had deleted my gamesave, so I had to start over, which was fine. The single player campaign is pretty good, but not great. I played through it and got all of the achievements. Some of the single player missions are very challenging and will take several attempts before completing, and even more if you want to make ace rating. Rabaul and Berlin are the two hardest maps, and anyone who can get through these maps with an ace rating on their first attempt....I salute you.
After unlocking all of the achievements I decided to try some online play, which I had never done previously; I had given up on the game before I played any online. The online play is very very good. The online community may appear to be low, but there is usually a room or two open, and if not, if you host, the room will fill pretty quickly.
I sent the game back since it was a rental and went and bought it again. I've really enjoyed this game. I feel I judged this game too quickly and I am glad that I gave it another chance.
Bottom line: If you like flying games, you should like this, otherwise, go play Gears.