The issue isnt about few normal occurances. The issue is a frequent appearance of different problems. Many of which are a result of bad design. For example both consoles had significant hardware failure rates which are difficult, costly to fix and sometimes outright impossible. I had a few and were a pain in the ass. The first time I experienced so many in a single generation.
This is a result of bad hardware design and cheap components.
Dead HDDs, BR drives, fans that get overloaded during the first minutes of play, YLOD.....I experienced some of these issues on two separate models.
We ve got many crashes, especially on the PS3 because its trying to do more than what its capable of or because the main software isnt optimized. This includes crashes and huge slowdowns while trying to access the XMB during a game. Its a highlighted feature that doesnt work as it was supposed to.
We ve got very slow load ups of simple apps such as the PS Store.
Thankfully I havent had such issues with my PS4 yet but time will tell.
I never used my PS3 very much, so maybe you are right about it having more crashes and slowdowns, but it doesn't seem to be the general case that I read about.
Shifty is right about lead-free. The industry was not ready. My workplace waited as long as possible to make the switch. Now it's something that is not an issue. Dead HDDs, BR drives and fans are a pain for sure. It's a symptom of performance requirements. Seagate is pretty awful, but as drives have gotten bigger and faster their reliability has dropped. They're mechanical. It's an unfortunate reality. Even the best lines of the best HDD companies have failures. I'm not sure that the fans or HDDs in last gen really had abnormally high failure rates. The red ring and yellow lights of death were definitely abnormal failures, but Shifty is right about the reasons.