Blizzard are masters of responsive games in general, so anything that doesn't come from them will feel dissapointing. It's also the main reason why WoW still remains one of the most popular MMOs, because even if Blizzard f**ks up everything else the reponsivness feeling is unmatched by any other game.
Stormgate will be the most responsive at 64Hz (or 64 ticks)—SC2 is 22.4, most other RTS are 8 tick.
No other RTS, past or in active development, matches Stormgate’s responsiveness. (At least as far as I know!)