Well, you know. The Reeve Superman movies were made in a completely different time. Back then the movie must've been sensational with the 'special effects' of a man flying. If you look back now all the CGI is just horribly done. I think you should just watch the Donner movies and enjoy then, considering the time they were made in. But I think Donner did good.
Even in 'Lois and Clark', in the 90s, CGI wasn't developed as far as it is now. And maybe it doesn't help that it's a series (but if you compare it with say 'Smallville', of course you see the difference). But I still managed to enjoy it.