I loved the old Sierra Quest games.
First one I played was the first Leisure Suit Larry game on my dad's home office work PC. I might have been a bit too young for the game's subject matter at the time, but I fell completely in love with the puzzle solving gameplay where you needed to type in actions and commands, and as a bonus it boosted my English language skills considerably (I'm Danish). At every game over I restarted the game from scratch and after getting daily game overs for more than a month at the point where you need to win $10.000 in blackjack to progress in the game my dad came home one day and told me he had heard some talk of "saving the game" on a floppy disc! We then figured out how that revolutionary technology worked and I completed the game that same day
Some years later I got my first Amiga 500 and played most Sierra Quest games released, up to the point where they became point and click, which I didn't like at the time. As for Police Quest, I really enjoyed the first one in particular. Since you played as a cop you had to be law abiding but I figured out ways to fool the game. For example, running a red light was a no-go, which was a pain because it meant just sitting there waiting. But, turn on the car siren for no reason and you're good to go
But, overall I don't think the Police Quest games were the best of all those Sierra games. My favourites were The Colonel's Bequest, Leisure Suit Larry 2, Hero's Quest (aka Quest for Glory), and Conquests of Camelot.