It looks awful. It just looks like a nondescript detective show (much like the multitude of other nondescript detective shows that have cropped up over the past few years)
I find it odd that they keep referring to him as "eccentric" and "alienated" yet (at least in the preview) he doesn't seem all that odd.And, although I'm no expert, he doesn't exactly scream Sherlock Holmes to me. House seems more like Sherlock Holmes to me than Jonny Lee Miller does in this preview. And maybe it's just me, but when Joan hints at him for going too far during the strangling conversation all I can think is that he didn't actually seem all that out of line. Speaking of JOAN Watson, there is something about changing John to Joan that is very annoying. It seems cheap. Too obvious.
I thought I would have to begrudgingly admit to thinking Elementary was a decent show. Jonny Lee Miller is pretty decent, after all... now I'm not so sure I'll have to admit anything 
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“The only people for me are the mad ones, the ones who are mad to live, mad to talk, mad to be saved,
desirous of everything at the same time, the ones who never yawn or say a commonplace thing, but burn, burn, burn!" - Jack Kerouac