Sorry to interrupt your argument with constructive discussion, but I thought I'd discuss what I felt Vita's problem areas are.
Most of Vita's problems, in my opinion, are forced errors; that is, errors that exist because of problems which ocurred before the PSVita was created, but continue to cause trouble. Examples:
1) Third party support. Specifically, the PS3/PSP rocked the notion many third parties had, which was that Sony was the obvious automatic winner of a generation. This significantly improved the support they received before those generations even began. Not having this advantage significantly hurts the Vita and it's essentially the first system launching without the "Sony is invincible" aura in place.
2) PSP system specs left little room for growth. That is, improving on the PSP essentially mandated PS3-esque graphics, but this has a huge downside; most companies (particularly Japanese ones, where most handheld support comes from) do not want to invest HD budgets in to handhelds games. This was an extremely difficult problem to avoid. This also mandated fairly high production costs for the system, at least to start with.
3) Sony failed to cultivate any strong, 1st party handheld IPs. This is something they again could have solved with the PSP, but the PS3 proved to be so resource intensive (as a consequence of its bad start) that Sony's own first party support for the system was not especially strong.
Again, most of these are per-existing problems which the Vita itself cannot be blamed for. The design team, I feel, did about as good a job as one can expect to mitigate these problems: they provided a variety of development paths for developers (PS Suite, PSN, actual PSVita 40 dollar games); they made the system apparently much easier to develop for; they used off the shelf parts to improve their cost reduction curve; they have invested more strongly in first party IPs, at least so far.
I probably could nitpick a few errors with the Vita, but for the most part, I feel the Vita's core problems are problems which developed over the 5 years preceding it, not a consequence of the Vita's design and production specifically.