It really depends on the class you're flying and the expectations you have. Their business class is vastly better than LH if only for the seats (I happen to like the food much better, and MAD is a much nicer place to transit than FRA). I've never flown them in economy but have seen others complain that the pitch is tight.

I also quite like their service and have had zero bad experiences, neither in air nor on the ground, in about 100 flights with them. I'm always puzzled by the people who complain so bitterly about it (and there are plenty here on FT), though I suspect it has more to do with the fact that it's not British than anything else.