I Kickstarted Planetary Annihilation, and it was interesting. Probably one of the more true to TA modern successors (even considering something like Supreme Commander), though with the addition of an interplanetary system.
Unfortunately, I don't really remember it all that well, in part because my computer at the time was a little underpowered to run it. I should go back and try it on a better system.
I really should give it a go soon, I'm trying to finish a few games before I start anything new though...