Re: XCom winning every battle and being too successful - I can tell you my first campaign in 2 was a disaster of constant defeat and withdrawal. If you lose missions, you fall behind in tech and resources, if you fall behind, you'll be outmatched by the new types of opposition and lose even more, if you keep losing, the Avatar Project gets completed and ADVENT wins forever.
This has always been my problem with XCOM overall. (Less the originals but it's still there.) Unless you're playing Ironman and agreeing to saddle up with that potential for failure, XCOM is a game about achieving best results. To me there's almost always tactically perfect solution for any battle for what I have. It's just a matter of finding it, in all the permutations of moves, cover spots, abilities and sheer RNG.
So I end up reloading a lot because that dude got revealed 1 square before I intended him to, the entire team misses all their shots in a round, the enemy decides to "scatter" in a way that is really problematic, you miss click and leave a dude out of cover....
There's just a million things that can go right or wrong. When I feel like I played as best as I could and circumstances still end up in injury or death, I'm willing to accept it. There's just generally always a way you could have done better or the RNG could have worked more with you, and it becomes a constant temptation to just "do it the right way."
Especially with Hacking for rewards. I've taken the time before to try every premutation of move/action combination to get that 21% chance to win an Advanced PCS. It's why my games end up taking forever. Or in LW2, having your whole force deployed when you FINALLY get that juicy 6 - 9 day infiltration to free a Scientist or Engineer and you're like "Man I really need that......*reloads*"
That's why I was kinda :\ on Alien Rulers. It takes this compulsion into overdrive. I remember painfully playing through one match against the Berzerker Queen because I needed her to reveal
just at the right time, and take the right amount of overwatch shots, and not path here or go there and reveal more enemies.....so she didn't just start slaughtering soldiers wholesale.
The problem is that when you do all that.....you never lose and success isn't a matter of skill so much as proper planning and luck. Missions can still be scary and intimidating and surprise you, but you always have an out.
That said, I like that the game can be played different ways by everyone according to their taste. It's just so RNG happy that, if you are an optimizer, it eats up a lot of your time.