It had fog of war, 3D terrain and viewer, many kinds of units, and a nice UI for taking arbitrary groups of units and giving them 1 or more commands. Even some nice automation (at later levels) to avoid the tedium of telling a unit to repair itself, then putting it back in formation.
One somewhat unique feature is that in campaign mode (playing a computer, not a human) you can control time, so you never get overwhelmed with trying to control your units, but of course as your skills get better you can speed up time to not be bored.
If controlling tanks, infantry, and (at the later levels), planes/VTOLS sounds fun then give it a try. The 1st level of the campaign is a tutorial and you'll know pretty quick if you enjoy it.
Ah, sorry, just realized you named Warzone2100, well maybe someone else will find the suggestion useful.