Hmm, tho is really difficult to decide, but if I would have to saaaaaay...
Love: PvPing against other people. Mainly when it is a more or less a fun playing field in which it's a challenge and not constant annoying spamathons with horrid weapons that are easy kill gains.
Hate: Frost Hydra/Summon Spammers in PvP, seriously, one of the cheapest ways you can kill people.
OP as hell weapon in PvP, rarely anyone uses weapons that don't get easy kills. Seriously, Ban Hammer (Pala Hammer) spamming, Terrable Aid (Terra Blade) spamming, etc. The 1.3 update is going to make things worse. Please balance PvP Redigit Dx