On the flip side, my 'enjoyment per dollar' on 3P products is muuuuuuuuuuuch lower. There are a lot more busts, and these 3P products tend to not be as cohesive with the official products, making them feel a bit out of place ... and it is very rare that 3P products provide me with something that I could not match in quality with homebrew material.
To that end, I voted no. It isn't that there is no value to 3P products - but the enjoyment per $ spent has just been so much less as to make it generally a bad idea.
I guess I'm picky with TPPs. One of the issues with these discussion is lumping ALL TPPs on one side and WotC on the other side. WotC's stuff is going to have a certain consistent quality, whether you like or dislike it, think the quality is good or not. Lumping all TPPs is going to have huge variation in quality.
I rarely find that I'm disappointed in TPP material as I am pretty picky in my purchases. In the first couple of years of 5e, there were some things I didn't end up using, but even then I read about the products and publishers, check out the previews, etc. So I can't think of anything that was surprisingly bad.
Now I mostly stick to publishers, like Kobold Press and MCDM, who I know put out quality products. Kobold Press, in particular is top notch from the balance, the content, the art, the editing, and thoughtfully prepared digital assets. MCDM is almost as good and getting better. I really like the mechanical innovations that add to, rather than replace the core game. I realize now that a lot of Coleville's stuff is 4e inspired. So some may argue it is not all that innovative, but I just find his material does a good job in bringing new mechanics into 5e that really fit well and has made running games more enjoyable.
I also have a spent a lot of money on Frog God Game's material and have a love/hate relationship with it. They get sloppy with some of their editing, especially older content updated for 5e. Their adventure paths tend to be very verbose, which doesn't make them the most easy to run at the table without quite a bit of prep, but I find them a nice antidote to WotC's anemic approach to its settings in 5e.