It does seem like everyone seems to get in, even with stats that seem below the bar that schools like to advertise. However, I think SDN just naturally has a concentration of the more gung-ho applicants who are serious about the pursuit of dentistry. I am sure this shines through during interviews, the application process, etc. Both of my high school friends who got into med school had either MCATs or GPAs below the matriculating average, and many of the dental students I know here at my school got in with slightly below the advertised average marks. However, all did their pre-dent here as well, and the bar IS lower numbers-wise for students who are state residents and did their undergrad here, because the adcoms know it is harder than any other school in the state, or even the Big 10 for that matter, with the exception of Northwestern.
PT and PA schools can be harder than med school to get in, especially PA. My sister is pre-PA and just finished her first year with a 3.7, and she may have to step that up to get in.
DO is a little harder than dental school to get in, however the nice thing about both dental and DO is that they seem to have more mercy on those who have blemishes on their records. This is an awesome thing. Some of the most motivated people towards a career in medicine or a career in dentistry that you will see here or anywhere else have blemish records. They are the ones that didn't quit like everyone else when they got a C (or worse!) in freshman chemistry. This is only further proof of a true desire for the profession, in my eyes. Neither school will take unqualified people, and both will make you prove your worth before acceptance. It is admirable that they seem to understand that sometimes, personal motivation and intangibles are more important than a couple of numbers.
Pharm USED to be easy to get in, but the massive publicity it has got lately in the news has created a huge surge of applicants. My school has received 40% more this year, and I know of two people with a 3.7 and 3.9 who were denied, simply because they had no exposure to the field. They just applied cause people were getting jobs in it.
Chiro has always been a cakewalk to get in, if you can pay for it and have any sort of passable grades. Same with podiatry. The compensation, security, and respect levels of these programs lag FAR behind dentistry, pharm, or medicine though.
Law and B-schools can be a crapshoot, I think anyone can get into a lower tier program, but prestige schools can be as tough as anything in the grad world. In no other area is the reputation of the school more important. Law is very heavy on the LSAT and undergrad reputation for admissions, and B-Schools look a lot at work experience. Most top-20 schools won't let you in without at least 3-5 years of major business experience. However, I know a guy who just got in at Purdue's top-25 MBA program, in the most competitive application cycle EVER, with a 3.2 GPA and he is currently a temp at my girlfriend's mid-sized company. Anything can happen. He may have rocked the GMAT too, I don't know. Purdue just passed up my school in the MBA rankings this year, and we would have laughed at his app...so its not just how hard the school is to get in, its what you do when you get there.
Want a real challenge??? Clinical psych. Good luck... My school is #1 nationally in it, and won't even process apps without a 3.6. Even then, your chances are under 1%, and that number isn't inflated by people applying to 20 schools like med or dental school.