I think you play your sole char better when you have boxed a full team. I have learned so much boxing my 5 team. I'm a total noob and still learning every time I log on, but i'm improving both in pve and pvp.

I have only played a handfull of AV, a couple went really well, and a couple went horribly wrong. I also got killed by one or two guys at one point. I was mostly in ilvl 187-200 blues. Even had some 15x on as well, and I had never pvp'ed... so going into a battleground at lvl 80 is a wakeup call lol - but good fun.