DaCostaBR: Hardly, Batman '89 came in a world that had already seen The Dark Knight Returns and Batman: Year One, and if anything it was orders of magnitude campier than those.
Breja: For comics book readers yes, but I imagine that for the wider audience the first thing that came to mind when they heard "Batman" was " Na na na na na".
You miss the point here. It's not inherently bad that people try to make film differ from tv show. The question is if the whole concept of Power Rangers (teenage team with superpowers kicking ass of cosmic villain) can be made into serious sci-fi.
Burton's Batman (as you've been told already) was capitalizing on the darkness already tested in comics. In case of Power Rangers they just try darker tones without a thought if it fits.