Final Fantasy X|V

The title sounds stupid, I know, but in Frontlines, dying both a) removes points from your team, and b) gives points to the team who killed you. For, say, Borderland Ruins, dying 10 times means that you've cost your team 50 points AND given the opposing teams 50 points.

Obviously, you're going to die some in PvP, but you can avoid it by constantly checking your map to avoid pinches, avoiding diving into the enemy team without support, and following your blob of teammates. Also, whenever you drop below about 4000 MP, take a step out and use your Standard-Issue Elixir.

I've seen lots of matches where my team could have just let the score tick up for 30 seconds to win, but last-minute deaths have us snatch defeat from the jaws of victory. On the other side of the coin, this means that contesting nodes (yes, even S-ranks) is absolutely worthless if an opposing team is about to win. At that point, your only hope is to force fights with the leading team.

Last, dying makes you lose half of your Battle High gauge. Each level of Battle High increases your damage and healing (stronger recuperates), and it's easy to reach Battle High 1 even if you don't get any kills so long as you don't die. Teams that build more BH tend to win.