Valley Fair is overpriced and really not that much fun. Compared to other amusement parks, the rides are sub par, the park is dirty, and the food is bad.
There are some rides I would go on, The Corkscrew is good, Steel Venom is good and I love Power Tower.
I used to love the place as a kid, but i've kinda grown out of loving Valley Fair, now all I really see are the flaws. But if you have kids with you, it can be more fun. It's kind of out of the way though, that's always been a downside for me as well. Not only would i have to pay for gas, but the ticket and any food I wanted as well.