Here's a motorized LEGO AT-AT (All-Terrain Armored Transport) that's cool enough to be worth its $130 price. Notice its rotating laser canons, cockpit that actually opens and most importantly, its lumbering walking style. Hey, there's even a little Luke Skywalker hanging onto a grappling rope underneath. [LEGO, via boingboing Gadgets]
Yeah, that's about my experience with the modern motorized and rubber-band action Legos. They work for the first two times (or two steps) flawlessly, but then pieces start to get loose and rubber-bands start to stretch and they go all gimpy. Same thing happened with the Destroyer Droid I had back when Episode 1 came out. You'd roll it on the ground and it would open up like in the movie, for about the first 2 times. After that it was "Aw, the guns didn't open up!" then "Dang, it fell on its side!" to "Woah, it's head flew under the couch!"