I think the problem with all that "NU", is that some of the pokemon that are there, actually do great OU, hell, even in Ubers (Parasect). When NU started, i thought something like "Finally a tier where weak, but funny in use Pokemon can shine." And what do we got? If i'll try to use PetaYanma, i'll get stopped cold by RegiIce. Uncool. Why should i choose CurseDon for Walling, when i can use Tangrowth. And what about Petaya Agility Venomoth? Why should i choose it, when I can have SubPetaya Manectric with his 105/105 sweeping stats. They're just ten point's less than Raikou's, which was Limbo/OU. You may say, that NU shouldn't be so called "Luvdisc Tier". But hell, we NEED something like "Luvdisc Tier". We should have balanced tiers, and In OU there should be good, strong mons. In UU there should be mons that can't compete with these in OU, but against other pokemon from that tier, they still do good. And in NU there should be pokemons like Yanma, Luvdisc, Lumineon, Torkoal. They sure can't be compared against mons from OU or UU, but when u compare Yanma against Lumineon, they are pretty balanced.
P.S I hope you understanded just a little bit of this. My English is like Luvdisc when compared to yours, which is like Kyogre xD