Watched the famously dire BATTLEFIELD EARTH last night, and thought it was quite reasonable as a diverting crapfest, if far too long. Those Psyclons are priceless...Possibly the silliest-looking alien menace ever, apart from the unbeatable gorilla in a diving helmet that pumps out soap bubbles (ROBOT MONSTER)
http://www.jabootu.com/romon.htm
http://www.rottentomatoes.com/m/battlefield_earth/