PMBO suffered from that drive for the records and WGT being a lunatic.
Regarding timing I don't think that matters, other Arrow hypers not ordered by idiots get rave reviews. Out of all they hypers I've done it is easily the worst, it probably goes Zadra, Hyperion, Stealth, Silver Star, PMBO
I’ve never really thought of Zadra and Stealth as hyper coasters. Yes they go over 200ft, but are they actually what you’d think of as hyper coasters?
I’d agree that all of the coasters you’ve listed (with the possible exception of Silver Star) are superior to PMBO and there are plenty of other far superior hyper coasters out there, but PMBO in the UK is still pretty unique, so I think it definitely serves its purpose for non-enthusiast guests, and is therefore still pretty popular.