just watched TO (Tee Oh) 1-2, they are separated story with the same theme
the animation is normal anime + 3D shadowing, quite attractive really, but have some weakness itself.
the animation is usually slow, not capable(i think) of fast, explosive action(there's explosion in the anime though)
but other than that, the graphic is passable for the anime.

the plot, is space themed love story, slightly. for the first one, the plot is acceptable, but the 2nd one plot is plain stupid at passable level. nice ideas in there though

overall it was an enjoyable watch :P try it if you dare