Photography is more art than a technical skill. If you have an IQ larger than your own shoe size, and you can read a manual and a book, you can quickly understand and put into practice the basics of photography. As compared to other professions being cited in this discussion, it's relatively low on the "how hard is it" scale in terms of being able to get a proper exposure.
The hard part is developing an eye for what makes a good photograph in many cases, especially as it relates to natural light photography. If you take things to the next level and use lights, things become even more complex, but still... nothing on the order of flying a commercial airliner or conducting an organ transplant.
But I must agree that if you want to learn quickly, reduce the number of mistakes you make, and avoid future bad habits a mentor is a great way to go. It's a time honored tradition, and one that has worked well for countless generations. As with any artistic medium, studying under the guidance of someone respected in the field or whom you admire is a great way to learn how to do things.
The internet is actually a great resource and you can apprentice under more than one accomplished photographer by making use of the medium. To say someone is "self taught" by the internet isn't really accurate. The content on the internet was posted by someone else. The internet by its very nature is interactive. It's not like the information just happened to populate itself out here. If you have access to images, technical information, and even better, the photographers themselves to ask questions of, that is in fact mentoring. You can post images using techniques detailed online, ask questions, get critiques, and take what you've learned to your next shoot. To dismiss the internet as a learning tool is pretty short sighted, IMHO. I find it amusing that so many people who use the internet daily find every opportunity to bash it as a medium in general. In reality the internet has revolutionized the dissemination of information. It is the most powerful information tool our civilization has ever built.
I used the internet to find people in my area I could work with directly. I found a 13 year wedding photographer that's very highly respected in our region who was willing to take me in and show me the ropes. We've shot many times together and I've sat for hours picking his brain. We've become good friends, and we met via the internet.
I've joined several groups that conduct studio photography instructional sessions that I found on the internet. This is where I first learned about studio photography and was able to get hands on experience. I met many very talented people this way, and again, have made many friendships... some virtual and others "real world".
I don't believe the professional landscape is any more polluted today than it was years ago. As JG Coleman noted, it's common for those with more experience to dismiss out of hand the new generation. How many times have we heard stories of the "good old days" by people who compulsively live in the past regardless of the topic? When I was in the Marines, our instructors constantly reminded us just how much harder things were 20 years before us. They too were told by their instructors how only real Marines were produced before their time... it's an endless cycle, one born of an over inflated sense of self worth and ego. As many of us age we assume our skills, experiences, and knowledge are superior to that of the next generation when in reality it's the next generation that brings a new perspective and forces evolution.
Imagine how boring music would be if the Beatles never came on the scene... or Elvis... or Lady Gaga...

They pushed the envelope doing things their predecessors thought were ridiculous, talentless, and even the work of the Devil in some cases. Not all new artists will be revolutionary thought leaders, most will wither and die on the vine... as they always have. Some will eek out a meager existence doing ho-humm work, some will excel... some will lose interest and move on to other things.
It's the natural order of things.