Rank doesn't mean much in this game. Overall rank is negatively impacted if you never fly one type of sortie (I almost never fly Buffs, and rarely do GVs, and it significantly reduces my overall score) so don't base how good a guy is based on their rank.
The F4Us are remarkable birds. Yeah, they're heavy (However the F6F, P-47 and P-38 all outweigh her by varying degrees) however don't underestimate her ability to maneuver. The flaps are the best of any ship in the game, and she maintains strong rudder authority at higher airspeeds than the majority of the plane set (great way to get the drop on guys in the vertical who think the F4U can't maneuver with them like that, kick the rudder hard and watch that big nose flop over into a shooting solution).