I'm a big fan of Falafel Maison and eat there regularly. Introduced to shawarmas on the platform of Finland Station in St. Petersburg (a big centre of shawarma production, by the way) I soon fell in love with them when I worked across the street from King Falafel in Toronto (they made the shawarma entry for Wikipedia even, and I had nothing to do with that...they are that good, though). Upon returning to Vancouver I searched high and low something that compared with King Falafel or even the ones in St. Petersburg, some of which are outstanding.
When I found Falafel Maison, I knew I'd found what I needed. The meat is spicy and a big greasy. Lots of hummus on the pita, tons of parsley, shredded lettuce, onion and tomato, with tahini and hot sauce as well. No tzatziki or any of that crap. Bold, contrasting hot & cold flavours, generous portions. There is not all that much grease, surprisingly, as the pita never gets soggy (the only flaw at King Falafel).
Oh, and Middle Eastern music pounding from the stereo, about six seats in total and the everyone knows you because it's family-run. If there's a better shawarma place in Vancouver, I'd be surprised.