Eh. A little overdone. I mean it's standard Forgotten Realms fare, but it's the sort of standard Forgotten Realms fare that makes people hate the realms. Unnecessary name drops (I'm almost surprised that Drizzt didn't slay one of the clones, with the way it was going), more irritating and difficult-to-pronounce names than I care to consider, at least one facepalm moment (of the "three that lived," two of them died... nice way to setup plot hooks for GMs, chaps, a group of clones where there's only one canonical one left), and nothing meaty to work with either. I mean what sort of Wizard is Manshoon? Did he favor illusion spells? Fire spells? Was he direct, sneaky? What was he like if I wanted to include him in a campaign? Paranoid? Even handed? Does he have any character quirks that I could use to let my players relate to him as more than 'evil NPC wizard number 22?'
So, yeah, to be frank kinda awful. Nevermind it kept inducing flashback to the Clone Saga from Spiderman, which is not a good place to be.
It's really sad because you have, in the same exact issue, the utterly excellent "The Haunted Battlement" in Eye on the Realms. I mean lets just consider the start: "Word is now spreading—after a fourth recent suicide, by someone who leapt from the battlement in terror—of a haunted wall-walk atop a fortress in Calimshan."
It's certainly not high prose, but it's compelling enough to grab my interest. It's certainly better than anything written in that Manshoon piece.