2.5 stars, realistically. When I was a whippersnapper, a new King novel was real cause for excitement - you could kiss the next two days goodbye as you were sucked in by his sheer readability, even if the plot dragged or the themes were less than compelling, his characters, his attention to detail, all of those things that wannabe-Kings aspire to; you'd take an early lunch break just so you could get back to the book. 
 Without spoilers, Revival touches on a theme that's actually terrifying - but King manages to make it, well, 'meh'. It's also awfully slim and pared down - not part of what makes King the King. 
 If, as another reviewer said, he actually has been replaced by a clone and some logarithims,I wouldn't be stunned. Kind of impressed, but not suprised. Coming on the heels of the just-awful Dr Sleep, I think we'll have to wait for another few books before we get a good one again.