The PDP is remarkably similar to x86. The complaints that people have written at length about typically come down to superscalar features not being exposed in the instruction set, which means that it can't be exposed to the programming model.
On the other hand, every architecture that has tried to expose them so far has failed; nobody wants to manually apply the Tomasulo algorithm to their code, or manage shuffling data elements into and out of their cache hierarchy.
On the other hand, every architecture that has tried to expose them so far has failed; nobody wants to manually apply the Tomasulo algorithm to their code, or manage shuffling data elements into and out of their cache hierarchy.