I quick save way to much, although when emulating games, I don't feel bad about quicksave stating. Many games, such as Persona 4, had insanely long gaps between save points. If I couldn't save state in Persona 3 Portable during the 4 hour killing run of the second to last block (the one that makes up about 33% to 45% of the game) then I wouldn't have finished that game.
Also with Skyrim and Fallout 3, I quicksaved constantly when traveling because why should I have to travel back into a fight I lost when I could just start right at the beginning. There is some genres tho where you simply should never quick save, such as Horror games, since it completely removes immersion. Except when I played Silent Hill. Fuck that game and its dick moves like spawning groups of enemies around entrances to rooms. That is just not cool. Thankfully that game is still immersive enough to be scary to this date.
EDIT: Oh and why the hell would you save scum X-COM? The first game was all about tense situations derived from the aliens ability to execute your entire team in a matter of moments. If you remove that, why the fuck would you play it? At least stick to what I do, and reload before battles (I only do it if the amount of elites I lost would have ruined all hope of survival for the X-COM project) while with X-COM Enemy Unknown, the game is so piss easy outside of Impossible difficulty and Impossible difficulty really is reliant on luck, (there is no change in strategy between classic and impossible to survive, you just need to get lucky and have the enemy miss) so its fine there.