They're terrible. First of all, you chose terrible maps to play on. Infinite is waay too big, even for 16 players, which is the maximum number of players that can fit on a map. It reduces the game to just running and that's pretty much it. Personally, I'd say the ten best maps are:
Battle Creek
*word removed*ation
Chill Out
Prisoner
Rat Race
Longest
Derelict
Wizard
Chiron TL34
Hang 'em High
Another note I need to hit is the use of infinite grenades. All that does is promote spamming. throw them to your hearts content because there's no cost to it.
The best weapon set to use is Human with generic starts. The bullets hit instantly (ignoring rockets and flames) which makes the lag a lot less painful.
Race is a terrible gametype. Use all the others.
Feel free to block me or whatever, because I'm seriously not going to return here. I'm just a guy that wants to enjoy playing Halo PC despite there being a world of almost no good Halo PC servers any more.