Certainly a lot of doom mongering & people not understanding who the market is for this range.
I'm 27 but I've been "modelling" since I was a tiny boy, this suits me perfectly because:
Smaller than OO Gauge (which what I currently model) means I can fit more into the same space - perfect as I dislike the size of N-gauge & 00 really is just too big for a proper layout
Cheaper (so far) than OO gauge, I'm fine with railroad less detail models as long as the price matches, I want a locomotive thats broadly representative I really dont care about accuracy
International standard, means I can model railrays from around the globe potentially on the same scale, no mix and matching HO with OO etc
What I would like to see, as other commenters have pointed out, is snap track to put together and take layouts apart much easier than sodding individual fishplates.
I mostly model GWR so once I see the Castle out (and any tank engines like Panniers or Prairies) then I'll be jumping in.
I completley see this as a range targeted at new-comers to the hobby & for families with the train sets, or for those like me who want something between 00 & N, I do not see it in the slightest as a competitor to 00 & nor should it be.