The truth is, cheese isn't exclusive to kid's shows. Heck, for my money, Power Rangers isn't even as cheesy as a certain classic TV show that legions of adults embrace even today. Sooooo, yeah. Not much room to throw stones!
(yes, classic Trek captured some brilliance in a bottle and isn't equivalent to Power Rangers. Just saying, though!)
I'll say this, I'd rather watch a Power Rangers episode than indulge in, say, True Blood and Twilight. Better to watch deliberate cheese than melodrama taking itself seriously.
I would suggest that it's not the medium, but the quality of perception and expression, that determines the significance of art. But what would a cartoonist know? -Bill Watterson