I did Great Adventure a lot as I was primarily based in NYC. This was my favourite of the SF parks for both rides and service although it wasn't without it's issues either.
I also did SF New England, SF America and Darian Lake none of which I particularly enjoyed.
There's two big problems at SF parks.
1. Operations. The staff are incredibly slow, they love to run coasters on one train even on busy days and they also love a a staggered opening.
2. Staff. I just found staff to be rude, lazy and totally unhelpful in many places. Even to the extent where asking a perfectly polite question you get sneered at.
I think I came across the rudest staff member ever at Great adventure. I remember him mimicking me in a fake British accent which I obviously laughed off politely and replied 'good one' and then he went into full on anti Brit rant about how lucky we are to have America looking after us and all that typical nonsense. Seem to remember him even mocking how we look and dress too. It went on for so long and was so bad I thought it was a prank. But apparently it was his attempt at 'humour'.
Like I said.....when I eventually make it over to the West coast I will definitely be doing MM as it's such an iconic park but after that I'm done with them. They are truly woeful Theme Park operators. The worst I have experienced.