Gwadar's value as a port is actually fairly limited. It has good sea access to numerous ports, but on land it's nowhere: there's nothing for anyone to ship goods to and nothing there to ship out. As a point of transit it's too close to other established and much better equipped ports to have much relevance. Commercially viable, probably, but in no way the next big thing.
I think the talk of a Gwadar-China link is much overblown. Possible, yes, but of fairly marginal significance and nothing to get all fired up about. I very much doubt that the Chinese would wade into Afghanistan to advance that idea; it would be miles outside the parameters of any cost-benefit analysis.
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