what i would find fun for more competition and more hours of gameplay available this would be the ability to play blitz as it is now as a "band" and then the ability to play each instrument separately as you can in rock band 3, even though i have over 1,500 songs i play a lot so even though i am starting again i will have played all of the songs within a few weeks. i know i can always buy more but it gets expensive to keep buying songs, having the ability to play band, keys, bass, vox, guitar, drums all with their own leader boards would be fantastic given that the amount of hours of gameplay would increase dramatically, keep the 2 note buttons, add in some single instrument power-ups you have yourself some major play time and some awesome competition.
You should be able to restart and change powerups in the first 10 seconds or so of a song without having to pay more coins. It's annoying when I start a song but quickly realize that I accidentally selected the wrong powerup, but I can't change it now without paying more coins.
Speaking of which, I just recently started paying attention to goals and doing them. My verdict; Facebook integration feels unnecessary. I know the dev team (was it the infamous Brain Chan?) wanted to integrate social networking, but it seems to me like the Facebook stuff just muddies the Blitz waters.
My brother and I are both on PS3's and both of us have the same issue. We can go and buy a song through Blitz store, download it and once it returns to the screen where we clicked on buy it locks up. We have to quit the game and reload it again.
one thing i think the game is missing at the moment is the number of songs in a section.
on rock band 2 and 3 (not too sure about 1) you can see how many songs are in each section weather it be from a specific artist or how many songs you have GD/5*/4* ect...
i think this is a much needed add on, i know it is not a major part of the game but some people have thousands of songs and it is good to know how many we have left to play or how many we have to improve on.