To sum up this show in one word: Terrible.  I didn't mine the lip-synching, I half expect it from a pop princess who has mediocre singing abilities.  But, I've always appreciated Britney's dance ability.... An ability that has apparently left her (or maybe she just doesn't really care) because Ms. Spears didn't dance at all.  Instead she jazz walked around the stage the whole time (if I was rating the jazz walk alone she'd at least get 3 stars).  Her lack of dancing was even more evident when she did try to half-a** dance when surrounding by her truly incredible, and talented dancers.  The entire audience was there to see one person, and one person alone and that was Britney.  You would think she could at least interact with the crowd who paid upwards of $100 to see her \""perform,\"" that her interactions would be genuine at least and frequent at best.  Not the case, she maybe spoke directly to the crowd twice and both times her phrases were so rehearsed it came off as unauthentic.  At one point a girlfriend I was with turned to me and said, \""You know what I like about Britney?  That any one of us could get up there and do what she's doing.\""  And she was right.  Britney was clearly phoning it in, and even from my mediocre seats I could tell her lack of passion.  She's either highly-medicated (probable) or just doesn't care anymore (even more probable).  What a dissapointment, save your money and go see the hundred or so other performers on the strip that still enjoy ENTERTAINING.  Hang it up Brit.