I'm putting here as I'm not sure how you really define finishing something like this maybe 100% both THPS and THPS2 or getting the 1000g/Plat but other games you can finish without either of those criterias.
To be on the safe side I'm putting here as I did about 78% of each game basically unlock last level and get a medal on it which is still a good amount of time put into the collection. Now back in the day I don't know if I 00% or not, certainly would have played it more and I remember unlocking likes of Spider-Man in one of the games.
I found it to be fun or I wouldn't played as long as I did and was the sort perfect game before work on a late as I could have few quick sessions without worrying I'd miss something important from a story driven game. Why I think a Switch version would have made sense as a quick session in portable mode would be great.
I've played a few remakes/remasters this year and if we were doing a award for best one of those in 2020 then this would be the front-runner as it's darn good.
Just overall in what a nice nostalgia trip but I would want more than just high scores if we get a new Tony Hawks game.