Why hasn't rocketboy done a shmup summary for xbox 360 yet.

[foxyg]

There are lists for Saturn Saturn, PS1, Dreamcast, PS2, there is even one for the Gamecube, but not for Xbox 360. Xbox 360 is in the final year of its life, and it is still getting a ton of shmups. It definitely deserve a list on Rocketboy. Its list will probably rival the Sega Saturn one.

[Kollision]

Xbox 360 is (...) still getting a ton of shmups.

That's why.
Wait 3 years after it's dead, then go for the summary.

[BulletMagnet]

I'm sure RB is planning to do one eventually, but as was said his is a "retro" site, so he'll probably at least wait until the system is more or less "done."