Well for me the holy trinity is actually Slippery When Wet, New Jersey and Keep the Faith. I don't think there's one song from those albums that I don't love.
After that would be These Days I suppose, although I don't think it's nearly as amazing as most people here seem to. Yes, there are a few songs that I would consider some of my favorite Bon Jovi songs. But unlike the previous 3 albums I really have to be in the right frame of mind (depressed?

) to want to listen to this one.
Bon Jovi, 7800, Crush and HAND I'll put all together in the next category. They each have a few songs I love, a few I hate, and a bunch that I'm just sort of indifferent about.
My least favorite is Bounce. I liked it right after it came out because it was something new, but when I listen to it now it just sounds like a mess.