This does not mean that it does not exist.
FALSE. From personal experience, it is definitely not extremely difficult to do well at HES. Depending on the classes you take, of course it will come with some difficulty, but what do you expect to find when/if you get into medical school, re-learning your ABCs? Yes, Rueckner's class IMO is probably one of the most difficult at the HES--mainly because you have to teach yourself out of the book--but that does not mean that all who take courses are doomed to fail. A lot of people did well in the course, but you do need to put in some effort. Furthermore, if you want to believe these horror stories then you must also believe the good stories. For instance, the dreaded o-chem is taught so incredibly well at HES that you have all the tools necessary to get a great grade in it. So don't be frightened by people who freaked out over Physics, you are not them...
Again, FALSE. What the heck kind of assumption is that? You are saying that all who went to HES and did well on the MCAT had bad sGPAs? And that they didn't get in because of just their GPAs from HES? Seriously? It is true that these courses will prep you well for the MCAT, but the latter is false. If you suck the big one at your courses, clearly you don't know the material well and how would you be able to perform well on the MCAT... Relax with that statement.
You just said that you couldn't find any good information about students going to medical school after HES. How can you now say that many students go to DO or Caribbean? Yes, maybe many students have gone to DO or Caribbean, but MANY students have probably gone off to allo as well (perhaps SMP prior).
I'm not sure where you are getting your information, but you can't base everything on advise you picked up from a few select individuals, which it seems like you have. I went to HES while working full-time, shadowing, and volunteering, and managed a 3.8 over 8 courses--including physics and organic chem. Plus I did well on my MCAT. Therefore, take my advise when I say that it can be done. HES is a great place to take post-bacc courses with great professors. You just need to be confident in yourself in put in the effort!