What pieces do you know ? I mostly listen violin/lute partitas (I sometimes prefer them transcribed to classical guitars (I really enjoy Vidovic and Bream renditions)). I do really like the simplicity of such pieces, which I find to be very lyrical, of course in a far different manner than e.g. Vivaldi...

The chaconne from the 2nd partita in D minor [BWV 1004] I find very powerful; very different from the Brandburg Concertos, which I tend to fancy less.

I mean, of course in the thousand of pieces he wrote, there are pieces that you won't like, and "greatest composer" is an impossible and absurd proposition.