I played UFO:ET last year and enjoyed it on the whole. You're correct - only Vipon Commanders are green, while the soldiers are the classic X-COM orange/brown.
I thought it was a pretty good game - the music was very good. Story was interesting enough, plenty of alien races and stuff to research... Biggest complaint would be that each set of new weapons (Laser, Plasma, Ion, Particle etc.) completely obseletes the last set. Endlessly researching new weapons for a slight stat bump is incredibly tedious. I'd rather they were fewer in number, or each had unique abilities or advantages/disadvantages compared to the other technology paths.