For me, the G-2 is far more stable than the Il-2 and Hurri 2D. I'm not going to try and take out flaks without help in it though.
With the 2D, I can sneak up on flaks, since it will pick up speed in a dive fairly quick (especially with WEP) and maintain it better. Come in through the trees and have your way.
Works if it was distracted long enough for you to hit the deck and have the speed to close the distance for the attack of course. The G-2 doesn't retain it's speed that well, so that's not really a viable option. With the Il-2 I can "snipe" flaks due to it's ammo load. Spray the flak from a good distance out (roughly 1.5 - 1k out) and it'll lose it's turret. Then swing back around and finish the job (unless it has sups nearby). A bit risky as a good flak gunner will hit and possibly bring you down. This is something I can't do in the G-2 since it doesn't have the ammo load to do it effectively, not to mention it doesn't have the armor to take the hits should I start taking them.
Many a con against the G-2, but for me, the pro's out weigh them.
More stable with superior guns to the Il-2 and Hurri 2D. It has greater range than the 2D (this is without ever using WEP), and I THINK the Il-2. Been a while since I flew the Il-2, so I could be wrong.
Then there is the key thing, she's damn sexy!