Well, I personally haven't had any real problems with the simpler systems. I have undergravel systems that have been up and going for years with no problems, I know most people hate them, but I find them to be cheap, fry safe, indestructible. I find them completly adequate with very little upkeep (I'm talking vacum a lil every few months, and you don't have to tear them down). If you use proper airflow, gravel size and proper gravel depth, they are amazing. I LOVE sponge filters. Love love love them. Again cheap, fry safe, no replaceable parts needed. My breeder/quarantine tanks have sponges.
I've had HOB filters but I found them to be a pain. You have to change cartridges (or recharge them) adjust flow rates.... Noisy. Fish get sucked into the intake tubes.... The really expensive canister filters are nice on reall large systems (several hundred gallons) but on smaller scale tanks they are simply not cost effective in my book. Too complicated to be easy to clean/change. The parts are expensive, and media needs changed too frequently. If I had canister filters with all my tanks I would be constantly cleaning tanks (and spending hundreds a year on media) Not enjoying my tanks. Instead I just have a few air pumps
. My weekly maintenance is quick and simple. 45 mins to an hour for multiple tanks. My experience comes from 20+ years of fish keeping. I am somewhat "old school" but I say "if it ain't broke, don't fiddle with it". The only real problems I ever had were when I tried to "change". My mother had 40-45 tanks in our house while I was growing up (literally every surface that could hold a tank, did) She bred fish for several local pet stores. As I got older we both did. I have since moved to an isolated area with mom and pop petstores and have continued to breed certain cichlids, live bearers, and tetras.