personally i enjoy the variety of gt5 much better than being shot down by the same guys in the same planes all the time. Il2 for me has too many problems that rely on players carrying a certain amount of honor and adulthood to solve unfortunately not all players carry on in said fashion.
Gt5 online has private rooms and an in depth ability to customize both the setting, the rules and regulations in both private and public rooms.
The variety of vehicles is also huge there are (admittedly alot of japanese cars i had never heard of) many different types of car classes standard road cars, custom tuning company cars, full on racing modded cars, GT cars, Le mans cars, Nascars, rally cars, and even formula 1 type cars, and the various race types to go along with them combined with varying road surfaces and weather make for a very extensive racing experience. Also the fact that you can send cars to your friends to help them to do those most difficult single player races or just to help them gain a car they really want for their garage is really cool.
Then theres the b spec mode: an Ai driven driver that you can provide basic instructions to, this mode is generally most dependent on you fielding the fastest car possible for your driver or successfully managing him or her,, this mode is a good way to earn some nice cars whilst not actually playing the game, I completely twenty laps on indianapolis which reading the latest book I'm working my way through. I am greatly enjoying it, But it's nice to know you miss us all the same