I'm not going to make a long review out of this so here goes...
Atsumare Goku World is a 30 video of some of the Z Fighters going to various points in the series via Trunks' time machine. At each point a character will call the audience using a telephone that comes out of a capsule. Each time a character calls they will ask a question, and then they wait for the audience's response (much like children's TV shows, Dora the Explorer in particular.)
It's an interesting way to recap certain points in the series, but being interesting definitely doesn't make it good, at least in my opinion.
All in all, it's not long and if you like DB/DBZ and can't think of anything better to do maybe you'll want to check it out.