I had the oppertunity to go his show last summer when I went to the Berklee summer guitar sessions.  When I saw him, I was blown away!  After he finished his set list, he answered questions from the audiance.  One of the questions was how does he come up with his rhythms and time signatures, and he reploed, "You know, people always ask me about what time do I play in?  Or where do these rhythms come from?  And I can't explain it.  I don't think like, 'oh, let me play a song in 4/4, or 7/8, or anything like that.  I just feel the rhythm, and play it.  A lot of the time my band gets lost because they don't know what I'm playing or what they're playing.   And I tell them, just play what you feel, just listen to what I play, and play something!  And you know what, it always sounds great!" 
Anyway, Lionel Loueke definitely is one of the best guitarists I've seen.  He was the first performer of the week at Berklee, and he was the best.  the other performers were, in order, Gary Hoey, Tim Miller Trio, and Joe Stump Group.  Lionel just has some of the best rhythm ever, and it really got to me.  enjoy!