I saw the first RED FLAG's with F-35s used, and no one had ever seen the F-22s more confused. No, it's not the best fighter at the merge--wasn't ever built purely to fight at the merge, though it sure can do it (with heavy energy bleed off in the first turn). It's got stubby wings, not awesome wing loading (Boyd would have hated it), and a bulky lifting body. But, it has monster AoA, doesn't need a Growler to go everywhere, almost more battlespace SA than an AWACS, a motor with more power than you'd believe, and more than double the internal gas of a Viper. And, world class low observability (good luck in a Super Hornet beak to beak many miles apart) and a killer AESA on the nose with gobs of power. The "Fat Man in the Magic Suit" doesn't fight like a Viper, but she's got plenty of fight in a different way, and much more effective against the latest threats.
Haven't met an operator who came from any other platform that wanted to go back, other than one salty F-22 test pilot that was still in love with the mighty Raptor and it's Air Dominance mission. Pick almost any other mission type, and the Lightning II is a top and most effective choice. Might be a Swiss Army Knife, but she's a real dang good one. Anyone who thinks the F-35 is under-performing is someone who is under-informed.
Too bad we cannot afford to sustain them. Not as bad as the Raptor, but not what the services planned for POM-wise, by a wide (but shrinking) margin. F-35 rant off.