I suppose the only major negative was the combat range of the F4U. I have read some information over the years, one gentlemen I forget his name who has flown the German and American planes put the F4U well above the ME109 but didn't seem to have too high a praise for it against the FW190s.
They flew well into the Korean war as AU-1 Corsair or ground attack aircraft. Maybe even call it the granddad of the A10 Warthog.
From Wiki:
On 10 September 1952, a MiG-15 made the mistake of getting into a turning contest with a Corsair piloted by Marine Captain Jesse G. Folmar, with Folmar shooting the MiG down with his four 20 mm cannon. In turn, four MiG-15s shot down Folmar minutes later; Folmar bailed out and was quickly rescued with little injury.
Always loved the F4U for standing out as sort of ugly duckling to some and just down right beauty to others.