is pvp a good way to level up ?

This will probably end up like the question: "Is CPQ good exp?"

The answer to that one is, "Yes, if you get a good team and are pretty much continuously grinding on rombots. But if you spend half your time looking for opponents who don't quit halfway through and don't fail to summon right, you would be better off training normally elsewhere."

PvP is probably good exp *if* you can continuously fight and win. Otherwise...