Yes! Henry and Amy have great chemistry together and the scripts in the released movies did their relationship justice, at least in my opinion. That's why I don't want the roles to be recast. Hopefully, the next Superman movie will advance their relationship. Being the alpha relationship in comic books, Clark and Lois deserve the opportunity to break new ground in the cinematic medium (marriage, family, etc.)
Of course Henry should defend Man of Steel. It's his movie. He should be proud of what he has accomplished. He shouldn't let the hating crowd deter him. Henry's real life charisma is one of the reasons I want a new Superman movie already.