Singer does his part, and I think most of us feel he loves the X-Men franchise, but outside of Reynolds, Jackman, and Singer, I don't really see anyone else promoting these films and their characters until it's actually time to promote these films. We've barely heard a peep from the cast of the F4 crew, and we've heard even less from the X-Men crew since DOFP. You even get the vibe that some of them really want out of the franchise. Maybe it's because most of them are better actors compared to the MCU guys and have a lot more work outside of these superhero films, or it could be they haven't been releasing as many films compared to Marvel, but it really does resonate with fans when these guys show appreciation. You would think this film is apart of the MCU with all the love it's been getting, Reynolds is really winning over all the fans.
Now I don't think any of the Marvel guys love the characters they play, but they do a good job selling it all the time.
The Fox crew should really take advantage of Marvel backing out of Comic Con.