If I ever could get my lazy butt in gear, I want to make a video to prove that you can solder competently with a cheap and crappy soldering iron.
I have a soldering iron that has to be the cheapest of the cheap, that I've had since 1991; I got it when I went to a local votech electronics school fresh from high school.
It's something like a 35 watt pencil iron, and the tip is janky like nobody's business. You have to wait like 15 minutes for it to heat up. The tip is not in the greatest shape.
But I can tin that puppy up and solder perfectly with it. Now, I'm not saying you could do SMT rework using it, but basic thru-hole is no problem at all. I've assembled tons of things with it over the years.
I also have a couple of older temp controlled irons - and they are great tools as well; honestly, I prefer them over my old iron. But I know, at least for myself, that what iron I use doesn't make a difference in the project, but rather the skills I bring to the table.
As the old saying goes, "a poor craftsman blames his tools"...