I liked when Plasma grenades were used sparingly instead of today's system where you can fill a hallway with it. I loved in Reach when I throw a frag where an opponent would pass, I drop his shields and with a headshot, drop him/her as well.
I just got my new Character Card from Mr. 007. And it's just phenominal. If you're wondering what do do for a signature. I suggest checking with him. Because his work is pretty impressive.
That would be great. But also they should have a custom game style, crazy gametype like action sack, but make it that you don't get credits from it so people don't boost it.