The problem with cans is the alcohol content leaches the aluminum. Not enough to be dangerous but enough to give the beer a distinctly tinny flavor.
If the beer you drink has so little hops and malt flavor that a few molecules of aluminum can be tasted, then I'd blame that versus the cans. Also, if you drink the beer soon enough after it's made, you really shouldn't have much of a leaching problem. Besides, it can't cost that much to line the cans, Keystone did it, they might still for all I know.