Harmy said:

I tried watching a few things (including SW) with rifftrax and I thought 90% of the jokes were pretty bad. It only made me chuckle a bit like once every 10 minutes. I still have to try watching the Holiday Special with riffrax though, there's so much comic potential, that it could be good.

I've only ever seen the live shows broadcast by satellite to theaters, and usually end up pretty sore from laughing so hard. Especially Night of the Living Dead and Santa Claus Conquers the Martians. The 1998 Godzilla was almost too big and bloated for them to conquer though.

Some of the shorts they've done are as good as any riffed on MST3K.