The #1 MOST IMPORTANT way to IMPROVE PvP is:
UPGRADE REWARDS from HORRENDOUS GARBAGE ALL THE BLAMING TIME to WORTH HAVING AND USING IN PvE as well as PvP
EDIT: This link describes how I feel about Crucible rewards... its ike I get a Toshiba Handybook every time:
https://www.youtube.com/watch?v=GEn15Rm5j4g
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Lag should be the #1 thing that needs fixing. It's almost pathetic in this technological day and age how shitty the lag is in this game.