I didn't find solo legendary to be that difficult.
(Minor spoiler warning)
The hardest parts of the game for me occurred when you were defending against waves of enemies a-la firefight. Two specific times come to mind. (Hint: Last couple of missions) Other than that, every enemy was relatively easy to beat once you figured out how.
If you haven't made it through legendary by yourself yet, let me offer one word of wisdom: Shotgun beats hunter, and our good friends at bungie were kind enough to provide those shotguns at (almost) every hunter encounter.
PS - Can we vote in arena yet?