What is "mainstream" and as defined by whom?
Consider that there are also reviews here for: The 7th Voyage of Sinbad, which plays on TCM from time to time; Allan Quatermain and the Lost City of Gold, Hallmark channel material; Army of Darkness, the most mainstream of the Evil Dead movies; At the Earth's Core, a movie based on a classic; Babes in Toyland, if it's been a Broadway musical I think it qualifies as mainstream; Buck Rogers, I mean c'mon if you're not going to complain about THIS being here then you've no right to complain at all; The Conqueror, it's a John Wayne movie and, uhm, nevermind bad example; Flash Gordon, I mean c'mon if you're not going to complain about THIS being here then you've no right to complain at all; Krull (WTF?) &tc yadayadayada
Heck there's even a review here for LEXX: I Worship His Shadow. That wasn't bad it was quirky, it pushed the envelope, it was sci-fi outside the box, it was. . .