While I used to enjoy the Solitaire pack bouncing out of my screen, I have to agree with @Zloth
♣ Having to write BAT files to start a game with special parameters so it would work on your hardware—not fun!
♦ Uneven difficulty from level to level, due to poor design and difficulty with testing adequately—not fun!
♥ Generally harder, probably due to video games first becoming popular in arcades, where the devs incentive was to keep you feeding money into the machine—not fun!
♠ Bad controls. Your dexterity didn't matter if your gaming device wasn't translating it properly on screen. Perfect jump? Nah, not on my watch!—not fun!
♣ Pixel hunting, those things were SOO frustrating, if you didn't click the exact pixel to release the object… Grr—not fun!
♦ No saves. Yep, so many games with no freakin' saves—not fun!
All that said: thank you old game devs, you birthed a beautiful industry!