I don't think it's necessary to give each tier either a number or letter, and definately don't think that one of those should replace what we already have. I may be a minority in this, but the tier names never confused me when I started. Adding a number or letter will just make it more confusing imo. I will agree that NU needs to be split, and I love RD's proposed name of RarelyUsed. There are way too many Pokemon in it, and some of the were not used even in the NU tier cause they sucked so much.
[19:35:22] <@Charmander> alphajolt just has the worst luck
[19:35:22] <@Charmander> like
[19:35:35] <@Charmander> his luck is worse than prem's lc abilities
[03:49:23]<toshimelonhead> jolteon's shiny looks like gf pissed on the normal one