Oh boy, best games ever have to go like this:
1: Contra 1,2, and 3 NES/SNES (Was teh best EVA with my older bro!)
2: DuckHunt NES (closest thing to actually shooting I ever played)
3: Total Annihilation/TASpring PC (No matter what engine it's on this game is badassery personified)
4: XCom PC/Dosbox via Steam (would be higher if a true sequel was being made, but it was spoiled by UFO: Extraterrestrials)
5: X3:Reunion PC (X3:TC expansion is better in all ways but runs so slow I can't play atm)
I noticed, Contra 1 alone lasted more than 30+ hours of gameplay for me and my brother at least when we were younger because that game is so motherfucking hard and unforgiving! And 2+3 continued that mean streak of you dying in humility so often you get fast with the controller just so you won't have to respawn at the beginning of the level again!