I have all the DLC's. Poly seems like they would be really good early on for exploring,,but I don't know if they would be solid enough in the long game.I think I really want to give England a go.....also haven't tried Korea yet and I wonder if they might be good on a water map.Also thinking about Spain....they could be good if u could get to Chivalry fast.
Honestly not an england fan. YMMV, but the slight extra movement has just never made that much of a difference to me. Which is a sham, England was by far my favorite in Civ4
it's really sotls combined with the movement that make england great on water maps.
the movement lets melee units move 5+ water tiles so they can at least keep up for capturing cities.