To the original poster:
Dude, you have Soundgarden in your name. Your location implies U2. And you are reviewing Smashing Pumpkins. You must have some freaking awesome music taste!
As for the Pumpkins, Siamese Dream is by far my favourite album. Every song rocks like a motha!! especially the one called Quiet. Love it so much! Hummer, Soma and Mayonaise... fantastic songs! Gish is also pretty great but not quite as much as SD. Mellon Collie I agree is too long. I once made a condensed single disc version of it which gives SD a serious run for it's money! Could not get into Adore much though. Haven't heard anything else, though I do know the awesome Stand Inside Your Love. Great band who were alas not as good on Zeitgeist with 2 missing members. :/