I've watched it, and while it is enjoyable, it's not an excellent work.
The CG is great, the acting is decent, but I guess what pulls the movie down is the slightly unrealistic (and cheesy) plot and the rather huge plot holes.
A lot of the times, the Yamato crew got through the dangers really easily. The way the enemies got destroyed was also done in a rather unbelievable fashion, and the ending was kind of mez.
It's a movie great for killing time, but other than that, don't expect too much from it.