Well I had 2 +18 upg rings (both had 5% magic) and I also had 2 feather +12 and 2 +18 insurgent chain.
2 chain +18 + 2 feather +12 was better than 2 upg +18 and the 2 feathers and was better than magic insurgent and upg rings +18.
As for crit rate being important for pvp.... ever heard about loop? XD