Ok so I just retried this and I would say if I could edit poll results I would give it a 8 instead of 7 now, or maybe 7.5 after trying it once again.
The software has more samples than Music 2000 and despite most of them are not very reliable, being mostly set of melodies, like if they were recorded riffs, some of the new ones are very awesome and when added into songs or edited they gives a lot more professionalism to the songs. Altough the sample sound quality is the same than Music 2000, there is more sound channels, multiple notes can be added in one slot inside riffs, making them easier to create. Also, like in Music 2000, reverb effect is Stereo and accessing the note parameters is as easy. However, there is some problems: First, sometimes the icons order in the menu (Riff editor, riff volume, clone riff, copy riff, etc.) changes when you press O while on a riff. For example the riff volume will be the second one on 2nd row, then next time you do this, Surprise! It's first! Then another time it's last in the row, lol. Secondly, the controls are very bad compared to Music 2000. You use a cursor that you move around the screen to select icons, riffs and options, and to scroll the screen you have to use the D-Pad. Basically the interface was designed as if it was for mouse use. Also, the controls aren't as customizable as Music 3000. In Music 3000 I have these two controls set on joysticks. Right joystick to scroll and left to move cursor. Not being able to change this as you want isn't very practical, as it is quite hard to both scroll and move cursor if both controls are on the same side of the controller. Also, the screen scrolls vertically, unlike Music 2000, where it scrolled horizontally. The bad part is that unlike in Music 3000 you cannot change it to scroll horizontally. On the song screen it isn't that bad, but getting used to the vertical riff editor takes a while to get used to, not to mention it is very hard to figure out on which octave you are. Also, it won't take long before sound memory gets full, and surprise! Now there seems to be a riff limit too! Altough this problem isn't as bad as it was in Music 2000, this can get annoying, because in MTVMG2 when the riff memory gets full while you edit one, the game will freeze! Basically, like with other softwares, save often!
What I found out is that it seems that you practically have to play both Music 2000 and 3000 to get used to MTV Music Generator 2. You have Music 2000 song making style, but with Music 3000 controls.
Note effects were removed in MTVMG2, but since they didn't worked pretty well in Music 2000 and since there is more sound channels it isn't much of a problem and you can easily create the effects yourself anyway.
Despite of its flaws I still like using this software, mainly because the features are still easily accessible. Memory limitations, despite still being here, are not as bad as in Music 2000 and allow better quality songs once you get used to the software.