Banshee's have to be flown in a very cautious matter, know what you're doing before you fly into enemy territory.
Also using a DMR and assault rifle together is bliss. You basically can survive any 1v1 encounter. The suppressor sucks huge ass in multiplayer, half a magazine or more and it doesn't drain a person's shield.
The suppressor sucks in general. Its only positive is having a large clip... if you are fighting 1 v 1 you might get lucky with flinches and score a kill. Literally every other weapon is preferable.
I played multi the first time last night. Only did two matches. One was SWAT, which felt great, though it seems headshots in mp are just as easy as single player. Most battles turned into "who shot first." I did okay. I was doing really well for the first few minutes, but near the end the other team got much more coordinated, so every time I turned a hallway it seemed there were two or three dudes already waiting. I liked the map though I can't remember what it was called. Reminded me of Countdown from Reach, only with mancannons on the outside. The second was CTF on Ragnarok. I tried using the Mantis right away, and spent the first half of the match crab walking back and forth behind our base on defense. No one approached, but I didn't get any kills. As soon as I ditched the Mantis the other team swarmed on us and won handily. I did terrible that game. Like 5 kills and 15 deaths. I was amazed on killcam, where it seemed opponents never missed. I can't compete with these kids who've put so much time into the game already. SWAT was fine because I'm good with headshots, but if I miss a shot during a duel I'm already gone. Might as well stop trying.
I didn't like Ragnarok as much as the other map, but I was never a huge fan of Valhalla anyway. Not sure why.