A few of the more finer points of flying an FM-2
1. It's a Spit Killer. The FM can out turn the most common Spitfires in the game and is only outclassed by the likes of the 14 and 16. Spit V's can out turn it, but the performance advantage is mitigated by the Wildcat's durability and guns. It doesn't take much to shred a spitty with the 50 cals.
2. It's hard to hit. The FM is nimble and tiny enough that it is very difficult to get a bead on it, and even if you do, it can shrug off a lot of damage.
3. You can dodge most BnZ attacks if you see them coming. The FM is a very stable plane and you can fly it comfortably while looking out the rear view. If you know where the BnZ'er is, it's very easy to get out of the way of its attacks.
4. If you know what you're doing, it's a great buff killer. If you have the patience to get to altitude, the diving characteristics are such that it is very easy to come down at a steep angle, lock onto a wing root or the forward fuselage and smoke a buff in one pass. Again, your small size makes it very difficult for a gunner to draw a bead on you, and you can take a fair number of hits without problems. The only problem is that faster buffs like the TU-2 and the B-26 may be able to outpace you.
5. You can BnZ anything you can't turn fight. Those pesky Brews, 43's and I16's do not quite have the engine speed of an FM2, so if you switch to BnZ you can easily take them out. The only dedicated turnfighter that you can't do this easily with is the Zeke (unless you go in with an alt advantage), but there's a whole thread out there that argues the pro's and cons of that matchup.
6. Newer players tend to underestimate it. Pilots who are unfamiliar with the Wildcat look at the icon and assume they can take it out simply based on historical data. Those pilots generally end up in the hangar pretty quick.