I Would Play Again If:

Matches didn't take so long.

Matches didn't start off so slow. Level 1-2 is either a "cheesefest" or a "snoozefest".

There were more "resets" to gamestates; in other words, the team that is definitively ahead doesn't only ever lose if they "throw" the game.

More power was given to champions and taken from champions and items.

Items were strategic purchases instead of personal offensive platforms; i.e. players would build around their team and their opponent's team instead of just what their champion needs in order to be useful.