This game is completely awesome and will leave almost anyone wanting MMPU2.
The most interesting thing about New Mode is that you can unlock the robot masters that you fell using only your Mega Buster as playable characters in all modes except for Classic Mode. The game contains a total of 11 playable characters, not including that there's 4 different versions of Mega Man (each unlocked by beating New Mode with Mega Man on different difficulties) and 13 different costumes for Roll (Roll and all her costumes are downloaded via the internet capabilities on the game).
Also in this game is Challenge Mode. It contains 10 challenges for each of the 9 main characters (Mega Man and the 8 Robot Masters) and 10 Wily Challenges, which are just variations of combinations to fight bosses. For completing all 100 challenges (no easy feat by the way) you unlock a VERY special prize, which I will not be spoiling here :) Trust me, you won't be disappointed, its totally worth the frustration.
As if all that wasn't enough, MMPU allows you to build your own custom levels. At first you start with basic sets to use to build levels but you can find many scenery and enemy packs through out the New Mode game and you can download a few, some have yet to be officially released via download, but people have obtained them by hacking into the game and uploading auto save files to the internet.
And to top all that off, you can upload your levels to be downloaded by all as well as download millions of levels made by other people. This game is literally endless new fun. You'd have to hate Mega Man to have this game get old to you.
I would recommend this game to anyone. Even people who hate other Mega Man games.