Nick R.
Yelp
My local! Well not necessarily my closest local pub, but if there's ever a question of where to enjoy a few fine beers, this place always wins.
Beer: phenomenal. Usually a good rolling selection of about 12 kegs and 4 casks with lots of bottles in the fridge. I would say the taps are somewhat consistent, but they do change it up, so not totally static. Casks change more often. They are one of the few places in London with Windsor & Eton Republika Pilsener on tap, which is pretty much the best craft lager in the UK IMHO. Try it, it never disappoints.
Food: USA style BBQ. Superb pork, great burgers. My recommendation is the mac and cheese. Give it a minute to cool off (read: I've burned my mouth on it) then dive in and pretend no one is watching. Bliss!
Atmosphere: cool vibe inside. Top notch canal-side garden outside. One of the best in London. Can get pretty packed on a nice day, but you can usually squeeze in.
Overall: there are other pubs in London with great waterside patios, and other pubs with craft beer, but I've yet to find one that rocks both as well as Union. Even though it's my local, I would happily commute here for a pint of Republika and a mac and cheese.