-Don't pair full parties with non-full parties. I don't know how they haven't figured this out in all of the years Halo has been on Xbox live, but it's the best and most obvious change to matchmaking they could have. -Remove join in progress and add harsher penalties for quitting with a possible vote to surrender button. -Nerf the Boltshot in some way -Nerf the Mantis. Remove the shield. -Make it so all the smaller vehicles die in one stick. -Give the Guass Hog less defense than a regular Warthog. Balancing 101 here... More offense, less defense. -Splatter physics need work. -Games should NEVER start with uneven teams.
That's all I can think of off the top of my head.
"Stranded in this spooky town." LoL IGN: Matt Is Legion, A Mole Sitting