The Ballard Full Tilt Ice Cream has the best playing games in town hands down. Other fun spots to check out are Olaf's and Add A Ball (both within a mile or so of FT Ballard), as well as John John's in Capitol Hill. The Unicorn (also in Capitol Hill) has decent playing games but is not a place to play pinball on a busy night. Avoid Shorty's, that place has a miraculous ability to suck all the fun out of playing pinball. Every game they have (minus maybe Champ Pub, TOM, and Centaur) can be found in better condition somewhere else in town.
Source: I play pinball 5-7 nights a week on location in Seattle.
Oh yeah, I forgot to mention: If you're in town next week and wanna play some tournaments, there are weeklies on Tuesday, Wednesday, and Thursday at 8pm each week. Tuesdays are at John Johns, Wednesdays at AAB, and Thursdays at Full Tilt Ballard. Also, if you're gonna be around during the week playing games hit me up via PM and I'll come say hi!