It's like any other age and genre. There's some great music out there and a lot of crap. Check out this clip of Jeff "Tain" Watts' group playing very modern composition in 2011. It's a very difficult piece of music with changing tempos in every section, but these guys make it sound very listenable, even to someone who thinks the 50's-60's were jazz's high point. You need to look.
https://www.youtube.com/watch?v=fPpciCh4i0Q
https://www.youtube.com/watch?v=fPpciCh4i0Q