I've been working with the idea that a failing of some blues-oriented players is the overuse of half-steps. The minor pent solves that prob, since it has no half-steps. The dorian mode seems to be pretty common, with the stipulation that the semitones between D-Eb and A-Bb of the C dorian not be used in succession. (I could have said that better.) Well, if you must play one every now and then, go ahead. But if you don't watch out, you'll sound like a European blues guitarist. This is one reason why Malmsteen can't really play blues with feeling. It's just another scale to him, as zips up and down, up and down. BB King, on the other hand, can use the dorian mode without it sounding classical or gypsy or something. Taste, stinginess, and not too many semitones formed by successive notes D-Eb or A-Bb. Super easy to verify the sound of this. Simply play a blues first, without successive semitones, then with them. Big stylistic difference. It might be interesting to play around with this, especially if it breaks some old habits and finger cliches.