I think it's pretty telling about Kennywood's impact and legacy that many of the reviews on this Yelp page are from people who don't live in Pittsburgh, whether they're ex-pats or just visitors.
Kennywood is just an ol' Amrikan classic to me. It's not Cedar Point and really shouldn't be judged against it. Despite coming up with rides as modern and great as the Steel Phantom and the Phantom's Revenge, it manages to keep that olden feel about it; perhaps a metaphor for Pittsburgh itself, methinks.
The coasters are fun. The games are impossible to win (sour spot for me). The atmosphere is great. And yes, Potato Patch Fries. I love me some rollercoasters but honestly one of the more enjoyable rides is the Swings.
Ok, time to end this rambling paean. I love Kennywood. It's old, new, fun, crowded and parking is a mess but I wouldn't trade it for any other amusement park.