why is it good?

Bets are always good. Especially crazy ones like yours.

you dont think LM2 will hit 2mil by years end?

This along with Lego City: Under Cover will be my March games. Quite possibly Need for Speed as well.

I will not be picking this up any time soon unfortunately. I simply have too many things to play at the moment and my Wii U/DS time will be taken up very soon by MH3:U (which I suspect I will play through most of April). I look forward to playing this sometime in the future when I have a lull but its not a must-play for me right now, in fact after Fire Emblem and Monster Hunter, I suspect Pokemon X (and may Mystery Dungeon: Gates to Infinity) will be my next 3DS obsessions.

I have been quite excited for this game, but I'm torn between which games to choose in April/May, which is when I'll buy my next game.
These are my alternatives:
Pokémon Mystery Dungeon, Luigi's Mansion 2 or Etrian Odyssey IV.

You may as well get Luigi's Mansion. Etrian Odyssey will come down in price quickly and Pokemon is free if you get a 3DS XL with Luigi's Mansion (I think).

Actually, It's either you buy Mystery Dungeon or Luigi's Mansion and you'll get a free game and I can't spend my money on another 3DS, I have to save some for the Wii U, when Wind Waker releases.

I'll probably play some game with myself or lean towards reviews. It really depends if Mystery Dungeon can make me reaply it several time, like the first two did. Lugi's Mansion is only a matter of it will get good reviews,  which it seems to be getting.

I have a feeling this game is going to give Mario 3D Land and Fire Emblem close competition as the best game on the 3DS. It seems Nintendo has put a crapload of effort into this one (hence the 2 year wait).

I agree. Nintendo pulled out all the stops for this one, including online multiplayer (which was a huge surprise for me).