Well, I guess I'm in the minority, but I've logged about 12 hours in Lunar Knights and I'm enjoying it quite a bit. The weapons are cool and there's a good balance between the two characters (besides the fact that one uses melee weapons and the other uses guns). The drive to upgrade your weapons, stats, and accessories -- the key to any good RPG, action or otherwise -- is certainly there. And I like the use of weather and sun/moon on the top screen. The terrenial (kind of like gods of the different elements) system and climate aspect can get a bit confusing, but does add to the game. The story is all over the place, but the cutscenes and voice samples are pretty neat.
Has anyone used one of the original Boktai cartridges in the bottom slot while playing? It supposedly gives you a big advantage (assuming you're playing near some sunlight) and will also unlock some music tracks and/or missions that you can't get otherwise.