Problem is, AMD is still AMD, you can almost guarantee that they will in some way or another screw up, even if they release 7nm a year before Intel releases 10nm, AMD will invariably screw something up with the release.
Its been this way with pretty much everything they have released in the past few years, 290 - Stupidly bad reference cooler, hot and loud, Polaris PCIE Powerdraw issues, Fiji just flat out rubbish, Vega see Fiji and amplify, Ryzen has been good but still falls behind Intel in single threaded stuff etc...
AMD are still a "Nearly but not quite" kinda company, i love them but just wish they could release something so polished it just has no downsides.
If they do get 7nm Zen2 out the door before Intel does their 10nm, it will be good for them, judging by the Zen+ refresh im excited to see how 7nm Zen2 shapes up.