I'm one who in general doesn't care for MO for American styles.
This. Well, to a point. When hops are the star of the show, I strongly prefer a more neutral malt. So I go for the plain two row pale malt. I just don't understand it when people brew an American Pale Ale or IPA with MO or tons of Munich. That being said, certain American styles, like an American-style Porter or an American Brown Ale, where American hops play a supporting role, can be very nice with Maris Otter, IMO.
As far as Canadian 2-row, I have used Gambrinus Pils and Pale plenty, and find the Pils to be an excellent stand-in for Belgian recipes (which is where most of my Pils typically goes). I don't brew lagers often, nor kölsches, so perhaps where the pilsner malt is the star, the Gambrinus stuff isn't ideal... Gambrinus Pale seems, to me, somewhere in between Great Western 2-row and Briess Pale Ale malt. It is the most convenient base malt for me to get right now, so I will be using it extensively for some time, but I wouldn't call it "English" in character, more "American," if anything.