I've tried to start the 4th series a month back as I wasn't letting Henry Cavill departing get to me that much. Its been okay so far. The first few episodes have some decent fights in them. I think you do feel the difference between Henry Cavill and Liam Hemsworth though and I'm trying hard to ignore it but its definitely difficult to do so.
I'll watch a few more episodes and hopefully the desire sticks with me.