Remember there are a gazillion ways to skin a cat. EMT is essentially the introductory course to EMS in general.
I took a month-long EMT class for my basic. IIRC, it was 5 nights/ week, and a skills day on Saturday. Whatever it was, it gave you (me) what you (I) needed to meet the minimum EMT requirements, which is exactly what most EMT schools, or courses meet...the minimum. There was no mandated NREMT when I got my basic.
Are there some more in-depth, or better paced programs? Sure, but again, EMT being the first in line of "feelers" for the medical, or public service arenas, respectively. One could argue either case for a longer, more professional format vs. what's currently, and predominantly out there. Most courses are as good as their instructors instruct, and moreover, how well the class, and its individuals take the material seriously, and digest it.
@hometownmedic5's post was pretty good, his analogies while true, still managed to bring a smile to my face; I never got the boot camp vibe from my condensed course, though. EMT school is hardly school.
You do have to absorb the material, but once you have your card, and get a job you'll see the realities of this field come to fruition; right, wrong, good, bad, and indifferent. This is typically where you truly find your career path, and go from there.
For now, keep looking around, and go with whatever program, school, or course best suits you. EMT courses hardly make or break your intrinsic desires to pursue higher, or further clinical education. Also, their courses all appear a little too rich for my blood.