Shaiya also has a pretty fun PvP system. Basically the mainland maps are non-PvP. Each major city has a portal to a PvP area which is similar to a Castle Siege except you go after altars.
PvP maps for levels 1-15, 20-30, and 1-60.
You get bonuses from blessings which are obtained from taking altars in the PvP maps. If all altars are taken you'll get full blessings which helps a lot in PvP and grinding.
You also have a PvP rank which is based off your kills. Everyone in your party gets kills from any of your members who kill someone. You can also turn in your PvP kills and deaths to a NPC for stat bonuses.
I personally give the game a 6.5/10 for overall gameplay and 8.5/10 for PvP