From a competitive players standpoint the game is terrible. Halo was always about everyone starting out with the same weapon, same abilities and same opportunities. With the addition of custom classes and abilities, along with a lack of variety of maps and no ranking system, it is obvious why the gane failed. It is repetitive, unskillful and overall unappealing. Also, making instant respawn default along with auto-flag pickup really messed up the pace and flow of the game. You don't even get unscoped when you get shot, how unskillful.
The game just doesn't feel like classic Halo.