More than one person reporting hashrates in the 40's.  What I can tell you is that Vega is very heat sensitive.  If the memory gets above 80C performance falls off dramatically.  Core temp also has a major effect on performance.  It seems likely to me the doubters are not optimizing their settings or lost the silicon lottery.

I've got near a month of mining at 40 and 42Mh/s with managable temps and apparently decent power consumption.