I guess you're talking about his solo spots; yes, they could get repetitive sometimes. But if you take a look at what I consider his essential recordings (mostly studio) I don't think that's true.
Jaco Pastorius (debut)
Bright Size Life (Metheny)
Trilogue Live! (Mangelsdorff)
Joni Mitchell albums
The WR stuff
Word Of Mouth (my favorite, the thing is brilliant and it's no bass showcase recording - although he pulls off some pretty wicked things on that one, too)
Twins I/II
(Toronto '82)
http://www.youtube.com/watch?v=0lO_-c8sZ2o (Montreal '82)