Most FPS - The only fps's I played to the end were Jedi Knight (original), Medal of Honor (another original), Farcry (started great but meh when mutants involved) and Call of Duty. These provided something new, especially the final level of CoD, remember the race to raise the red flag? I had just finished Antony Beevor's Stalingrad before playing CoD - it was a very fitting gesture to the couragement of the red army, but also the desperation of the germans who feared the retaliation.
Since then, all FPS have been stale in comparison with little to offer new.
As for Supreme Commander? They are robots not little people! Robots are cannon fodder and can be recycled. T4 robots are mean to be mega-massive devastating war machines that sweep the land, wiping armies and provide the "Oh Sheeeiiit!!!!" factor. If you want to care for the robots, download the Black Ops mega-mod packs which expand the rpg elements for the Commander units and also improves the exponential veterancy system for all units - When your tank has lvl 25, you will protect it at all costs thanks to its extended range, hit points, health recharge, etc.
Empire Total War - I had the same problem, it's not MWII and it's buggy. Well the latest series of patches have made it stable (still the odd crash), but read Saul David's Victoria Wars (I know E:TW is set 100 years earlier) and you understand the problems and tactics of early rifle warfare - reliability, range, volley, formations and the Officers' incompetence based on commisions gained by wealth and not experience/training.