I wont download 99% of free games because most of the time the game looks like Ill delete it after 20 mins, Even if it looks cool, but someone has a video posted in the comments that shows it's a 10 min playthrough. Just not worth the time of downloading/extracting/etc/deleting.
However, browser games I'll play no matter how dumb it is, unfortunately, nearly all browser games are only good for 5 mins.
I will only download games that clearly have time and love put into it by the dev, will be immersive, and have hours of content.