Ha! You wanted to rant about a weak civ and chose not India, not Germany, not Japan, but England? For continents or even pangea plus really, they do just fine (though try to make sue it's not too wet and hilly or the longbows will get really glitchy with all the trees). They are a pretty strong civ, and by the looks of things only set to get stronger in BNW with the importance of defending maritime trade routes.
The UA is regularly seen as 2 more moves on a 9 movement destroyer, which is not so great, but it's advantages are especially pronounced early on (as with all civ games, that's when it matters most). Importantly it applies not only to scout triremes (6 movement at sailing!) but also your first amhibious compbow attacks take only half the time to travel and in the drink where they're vulnerale. workers and settlers travel faster in water than land, so you can expand your civ and boost infrastructure along the coast quicker than other civs. Cumbersome and slow galleas attacks are a thing of the past, and they'll be active on more turns and get further towards logistics, which is exactly when SoTL's get silly. OK, so you can't take every capital unless you're on small continents or less, but in pretty much every domination game I've played, once you get 1/3 to 1/2 of the way there, it's pretty much over anyway, and only a matter of time.
As England, the benefits on a water map are not only military but expansionist. You can settle across the sea quicker, take more puppets quicker and require less navy which can be spread more thinly in order to defend your empire, meaning you can spread to the far flung corners to grab the best spots without worrying as much abut defense. Your wokers and great people can tranverse between locations quicker and your missionaries can move between continents quicker.
I would go on about the UU's and 2nd spy, but they already seem pretty well covered. Needless to say, I don't think any of that's weak either.
England's stuff is all good, and when played correctly provides a lot of synergy between pieces. A strong civ, but also one with a fun and distinctive style. What more could you want?