No, I understand where you're coming from. Probably my biggest disappointment with the MCU so far is Whedon's portrayal of Ultron, in which he turned a remorseless, unstoppable killing machine into a wise-cracking smart ass. I f*cking
hated it. So if you have that same reaction to Thanos, I respect that. Very unscientifically, it seems that the majority of people I've come across are thrilled with him, but you definitely aren't the only person I've seen who wasn't a fan.
I just can't stress enough, personally, how much I also hated that specific angle of the original Infinity Gauntlet when I first read it. My background is that I was a heavy reader/collector in the mid-late 80s, primarily X-Men. At that point Thanos was very much a fringe character; I don't even remember him from the Marvel Handbooks I used to pore over. So when he was introduced at the end of Avengers, I didn't even recognize him.
So, as has been the case with a lot of these movies, I went out and picked up some trades to familiarize myself with the character and the stories they were adapting. And while I liked him overall, and especially the concept of the Gauntlet, I didn't like his motivation in that story at all. Like, I thought it was one of the more ridiculous things I've ever read in a comic book -- and that's saying something, because they are by nature somewhat ridiculous (and I say that affectionately).
So whenever I see people complaining about that, kind of like people sticking up for Zack Snyder's abortions, it kind of gets under my skin. But it's whatever; you're absolutely entitled to your opinion.
My thing is, a lot of these movies bear very little resemblance to the source material. Civil War and Winter Soldier are nothing like the books, outside of the general inspiration. Age of Ultron was pretty much just the title. And so on. Personally, I think probably 90 percent of the adjustments/alterations they make really work well.
This was one of them, IMO. Using Gamora wasn't really based on the Lady Death thing whatsoever. It was simply a way to anchor Thanos and give him an added dimension and some level of sympathy so that he's more than just the psychotic murderer he's often portrayed to be in the books. She's also a means to show just how far Thanos is willing to go to achieve his ends, which mirrors and augments the relentless manner in which he plows through our heroes. As I saw somebody point out elsewhere, they weren't willing to make the ultimate sacrifices, but he was. And he won (for now).
All that said, I respect that you have a different opinion.
EDIT: Ha, just stumbled on this. Looks like they did take the overpopulation thing right from the books.
https://io9.gizmodo.com/thanos-motivations-in-avengers-infinity-war-have-much-1825660879
Need to get Dark Knights Metal. Missed the weeklies, so will get the trade when it comes out. AND they don’t have it at Midtown! Weird. 
Then you don't have many other friends who are comic nerds like I am / like the friends I have or talk with other comic book guys. Unless the people commenting hate Snyder (which is a large contingent and one that I am 
