I definitely don't think MOS made people fall for the character the way properties like Captain America, Iron Man, etc, managed to. If anything, I suspect it must have solidified on many the perception that Superman is a boring non-character, a brawler with big powers but little underneath, being the glum, brooding jaw-clencher that this film mostly portrays him as.
It's why, as much as I've got an eye on BVS and the upcoming DC slate, I have to acknowledge that Snyder is quite simply not the right fit for Superman. He's not the absolute worst, he's not a hack... but he's not the best either, as simple as that. He's a mistake, one that's gonna stick. MOS gets to the point where the character-driven scenes feel mandatory instead of a priority, as if he thought they were simply an ingredient you have to throw in. But as soon as he's done with them, bam, onto the next action set piece. Example: Even for something as simple as Jonathan Kent's death you have to throw in a tornado, because a heart attack is just not cool enough. I know that's the story they wanted to tell, but that's my point: it's poorly conceived. That's where you see where the director's priorities lie. And it's not in character.
Before this, there had been TWO good, well-received Superman movies, and they're old as time. Then there was a bland nostalgia piece that bored everyone. And then you have this film, which finally gives you a Superman that fights a lot and makes full use of the tools of "epic", modern filmmaking. And it has Hans Zimmer music! The comparisons to previous depictions are pretty limited, and at the risk of sounding presumptuous... I'd say that's where some of the positive fan reception comes from. "It's recent, it's what I have and it's what I'll have to live with for the next decade or so, so I might as well like it". Speaking for myself, it's ****ing crystal clear the way in which this film misses the point of MY Superman. The stuff that sets the character apart, the ideas that he should be able to pull off better than ANYONE... this film completely misses out on. It's just not its priority. Just look at that 3rd act. It's an ok film and it has a handful of great stuff in it, but it's also a colossal missed opportunity. It's not the movie the character needed, for my money.