I've never been to any other paintball fields, so I don't have anything to compare against. The refs are professional in most cases; I've even played with and against some of the refs (who just so happened to not be scheduled to work that day).
The biggest problem I have with this field is the amenities. The buildings look dilapidated, and the restrooms are downright horrible. The restrooms have grafitti and have urine all over the place. Really, I've never had to use the restroom that bad. Save it until you get home. Oh, and the problem with the cows is just the nature of the city of Corona; I don't mind it one bit.