His Superman movie was never his fault and he showed what a great Superman he could be in Crisis. Would love to see more of him

Superman really needs a good script.

Both Brandon Routh and Henry Cavil were good picks and seemed to show passion for the role, but neither was given much to work with.

Even as a sequel to the Christopher Reeves movies, Superman Returns didn't really do anything with Superman, was mostly about Lois and Lex's stuff. Superman just kind of stocked Lois and had an occasional action scene. Didn't even talk to Lex.

The idea they were going for in Man Of Steel was a good one, a Superman trying to find his place in the world, problem is outside of that, we barely got to know this version of Superman, with most of the movie being action and what character stuff there was, was mostly exposition, then in BVS didn't move him past that, if anything he was even more alienated. Hell at least in Superman Returns Lex and Lois had story, but in BVS, nobody really had a satisfying story, more like each character had a series of events. that's technically story, but not really much in terms of character story.
In The Dark Knight, Bruce had to accept the limitations of Batman,
In The Dark Knight Rises, Bruce had to move on from the past, past Rachel and Gotham.

Nobody really had much of a full arc in BVS, at least not anything properly executed enough to be believable

Routh will never be an amazing actor, but he wasn't the biggest issue with Superman Returns by any means. The issue was story. What we got was a muddled half-continuation of the Donner films which followed on from Superman II but ignored III & IV, with a different take on some of the characters. And that to me is why really, it fundamentally didn't work at the core - neither the viewer (or perhaps even Singer) had a 100% clear picture of what this film was trying to be. They should have started with a clean slate.

Superman Man Of Tomorrow kind of took what worked about Returns and Man Of Steel and made something a lot better