I shop for a game as follows:
First, I have a set of criteria for a game that gets me interested in a narrow range of titles (thank goodness). Early 80's solid state pins (1980-1982) with multiball and speech are my sweet spot, with a few select system 11s. I also take into account how much support there is for reproduction parts.
1. Listen to the game on youtube 10x (without watching it) -- if I love the sound set then step 2.
2. Watch the game on youtube by as many players as possible. I can tell by HOW the players are reacting to the ball what kinds of action the table is giving.
3. If the artwork/theme is undesirable, then it's off the list
I can still hunt for a game if I've never played it. Of course I'd prefer to play it at least a few times to make sure the title "feels good."
-mof