I mean, when you look at the plastic ones, they don't look as detailed as the metal ones. Maybe it's just the images I've been seeing, I haven't seen any of the new plastic ones "in hand"...so I can't give an honest impression of them.
I sincerely hope they are just as detailed as people have said, I really do...but for myself, I'll stick to metal. Just something about the weight of them, and maybe a little nostalgia when I think back to my first mech purchases in the mid 80's. For me, plastic just doesn't cut it, but I know a LOT of people that love them.
So it just all comes down to preferences. I'm not knocking them at all...I just can't see the detail clearly enough in pics as I'm more of a hands on kind of guy unless there's glaring errors, then I will call it out! LOL