I don't know what I like more: the fact that there is a place in Vegas where I can spend hours playing pinball and video games for their original price of 1 quarter (well, some newer ones are more expensive); or the fact that the hundreds of machines are maintained and curated by one guy as a labor of love.
Some folks don't like the fact that the museum is off-strip in some random warehouse building without the glitz and glamour of a big-budget "attraction." These are the things I *love* about it. I love that the hall of fame is run by someone who loves pinball more than they love money. I love that I can play here for hours (until my wife or friends get bored and want to leave) for less money than I'll lose in 10 minutes at a craps table. I love the fact that this feels more like my friends garage than a tourist trap. I love the fact that so many of the video games I played as a kid are here.
I'm not very good at pinball and don't particularly enjoy it, but just walking around looking at machines from the hundred years or so is fascinating. Some of the non-pinball games like the 70s "Ice Cold Beer" skill game and the turn-of-the-century nickelodeon are awesome. Plus, I finally got to play Elevator Action and Spy Hunter for more than two minutes - both feats that eluded me as a lad.
I can't imagine a trip to Vegas without a trip to the pinball hall of fame. Anyone who was raised during the golden age of arcades (70s - mid 90s) should definitely go here at least once.