There are several good resources currently in existence: www.rvparkreviews.com and Tripadvisor. While the latter has some parks the former has almost all parks. I prefer to read the comments of actual visitors to these parks/resorts.
I have my own "rule" about staying at a particular park. It is similar to one I used to use when advising people about an apartment complex: If it is full of junk rigs/cars you move on. Full of late model rigs/cars it might be ok. Not very scientific I'll admit but it has worked for me. I might feel different in a few years as my MH ages but, for now, it works.
