The music player is decent, partially because there aren't that many good music players on android. Perhaps more options (change pitch, an equalizer, speed, etc), and also the interface needs work, one thing that I dislike is this auto changing from album to album art, gets annoying. Also the menu at the bottom that shows all artist, albums, songs, etc, is really ugly and should be removed/reworked. One thing it needs and is a MUST for me to ever use it, is to limit my music to a folder. I HATE music players that don't have this option as it will load sounds from my navigation program and games. Annoying.
As for the video portion. Absolute crap right now. Takes awhile to load, and doesn't play video codecs that android supports that well. Needs a lot of work, and if it could get more codec supports like xvid/divx, avi, mkv, etc, then I could see using it.
Photo gallery is worse than the stock gallery. Ugly and no options really that are useful.
The music portion shows potential, but it has a ways to go before I'd use it more than just to try it out.