Singing and dancing:
Ongakushuu 2 is non-stop singing and dancing :-)

Important Actors:

Miyuki Kanbe as the third Moon

Murata Ayumi as my favorite Venus

Kawabe Chieko as a very good Mercury.

Takagi Nao the 2nd Uranus. A very popular Uranus

Asami Yuhka as Neptune, a lot of people associate her to Nao.

Hikari Ono returns in the role of Vampiru (former Starlights, Hawk's eye, and Prince Demand (all in the Sera Myu).  She also does other stuff like her self produced Nazo no Punk Lady and Ninja Yell

Mochizuki Yuuta returns from the dead (and his retirement) to play Dracul.  Also plays Tuxedo mask and King Endymion in other myu.  He also was Kamen Rider J and Tyrano Ranger in Zyurangers.  He's also one of the F4 in Hana Yori Dango

Kawasaki Miki plays Le Fay

Tominaga Kenji as Dark Cain  (also plays Wiseman, sensational Jaguar mask, hiru hiru man, as well as was the stunt double for Kamen Rider Kuuga)

Bad:
Nothing comes to mind.

Good:
A touching farewell to Miyuki Moon

Bonus: