Me'thinks a lot of N1K and Spit drivers are getting wacked by La7's and thus the cries to perk it. It's a good plane to kill low Spits and N1K's, and can run away (which it spends a lot of time doing), but it has some serious issues also, including:
-lack of any range.
-very poor views to sides and back
-poor performance above 14K or so
-poor guns (hopeless outside D300)
-somewhat weak tail assembly (tends to come off a lot).
It's a good plane for kill'n N1K's though, cuz if you don't get the shot you want, you just level out and dash away...
-Soda