So, I just finished Mystery P.I. - Lost in Los Angeles, after about 8.5 hours of playing this game.
Would I recommend it?
Not necessarily. It is too repetitive for my taste to be a game worthy of recommendation, and overall, it reminded me a lot of Escape Rosecliff Island, which I finished a few days prior to this game. The game concept is pretty much the same - search for hidden objects, then do some mini games in between, like match 3, memory, and looking for words in a mess of letters - and overall, it doesn't feel all that innovative.
The story with the search for the lost film, as a private investigator, is just a little flavor for the game. Not more, not less.
Overall: if you get this game, buy it at a time it is a lot cheaper than usually. For giving me less than 10 hours of gaming time, it doesn't feel like this game is really worth a lot.
I purchased this in a bundle of Popcap Games, which also means I still have three more Mystery P.I. games to play. And I will play and review them.