I find knowing the maps and player tendency to be key to pvp. I'm running a Titan as main since day one. Used to get destroyed on a regular basis. At one point I had over a 1,000 more deaths than kills. Over the last 6 weeks or so, I've shaved that down to around 200. Looking forward to breaking even in a week or two. Just be careful and think about your next move instead of blindly rushing in. Also, take what the map gives you and practice, practice, practice. Good luck fellow smash bro.