I have been to San Diego for a week two separate times and had very different experiences. I have kids so when traveling I look for swimming pools, beach, playground, etc...
San Diego KOA
was awesome. We stayed in a Kamping Kabin.
Second time in S.D. we were going to Seaworld so stayed at Campland on the Bay
. The most "ghetto" like RV park I've ever been in. It was a weekend and every site seemed to have 3 cars squeezed into them. It might have been a nice place mid-week but was WAAAAY over-crowded when we were there.