Okay /v/ it's time we talked about this series. I know, I know "kiddie shit, re-hash, BAH-BAH" and all that, but putting aside the green text and buzzwords. What actually happened to this series?

>New Super Mario Bros
First 2D Mario in 15 years.
Introduced the star coin collection system
Introduced the toad a 1-up mushroom houses
Introduced the mini and mega mushrooms
Had unique bosses for each worlds, something only done in the Land series.
Brought new music, most of it was actually pretty good.
Introduced the triple jump

NSMB was a great comeback for 2D Mario. So far, so good.

>NSMB Wii
Introduced 4 player simultaneous co-op to the series
Brought Yoshi back
Brought the Koopalings back
Brought Superstar road back
Introduced Penguin and Propeller suits
Re-mixed the music from the first game, made it worse with added Bah.

NSMBWii as a whole defined itself by borrowing ideas from the old games to try and stand apart from it's DS older brother. Didn't bring much new to the series, but, managed to make Mario into a co-op experience. So on the whole, a decent enough game

>New Super Mario Bros 2
Oh dear
Introduced coin rush
Introduced paid DLC
Ruined the music with one too many BAH
Brought back Reznor
Introduced Golden Mushrooms

NSMB2 is the first instance of rehash with this series. It didn't bring anything new to the main game, and tried to cover it up by switching focus to coin gathering. This is the reason why the series has a bad stigma.