As an Annihilation Marauder, and raid leader of a successful nightmare mode 8 man ops team, as well as a successful 16 man raider, I can assure you that the melee difficulty level in regards to Flashpoints and Operations is perfectly fine.
It may be that melee just isn't your thing, and that you're better at your trooper. And that's fine, nothing wrong with that at all. But completely neglecting the possibility that you're just not so great at melee is a mistake, and blaming it on the game is just ignorant. It may be that it's a little tougher for melee, but it's certainly not unreasonable.