Adega is an impressive spot with quite decent seafood and other Portuguese specialties. However, I think the combination of really good service and a super convenient downtown core location cause it to get a bit of ratings inflation. I was quite surprised to see it listed as the # 1 Toronto restaurant overall in TripAdvisor. Frankly, I don't even think it's the # 1 Portuguese seafood spot in TO.
The food was pretty universally tasty and well prepared; the cataplana was top notch filled with high quality bits of fishy goodness, the prawns were tasty and properly cooked and seasoned beautifully. The only dish that let me down was the octopus. Not that it was at all bad, it's just that I had recently been able to consume some of this most delectable cephalopod at both Joso's and Chiado and they have set the bar ridiculously high for the Toronto scene.
Adega seems to be a pretty regular tour stop for Mws2 (Men Who Still Wear Suits) so if you're allergic, best to steer clear. The regular bookings of drug reps, investment bankers, and other assorted rogues do put quite a drain on the service in the place. Eating hear when large groups are being accommodated is sure to rev the frustration engines well past the red line.
Bottom line; you'll eat well at Adega and, quite surprisingly for the location, you'll do so at a fair price. There's quite a lot to like about this restaurant, just not all that much to love.