Of course you can like Radiohead! I think we SHOULD like Radiohead because of "In Rainbows." After that last album full of noise called Kid A, they should be applauded.
I go in cycles. I'll listen to U2 non-stop for months at a time, drifting from album to album and then into some of my favorite live bootlegs (currently it's Stockholm Zoo TV), but I do tire of it. I NEED to hear new stuff.
I checked into Radiohead just because I wanted to support their experiment with no label...and I ended up loving it! There isn't a lot of new music to love, but you have to keep trying new things.
Or...look backwards. I've just rediscovered John Lennon (post Beatles) and I've loved every second of it.
U2 can always be your first love, but there's no harm in branching out.