One of the biggest flaws is that since we still use a cylindrical map, there's a ton more tundra in-game than in real life, so you can be stuck in just massive stretches of tundra. If it was more globe-like, then the tundra stretches would be smaller and wouldn't appear as daunting. Or even if the map generation tended to make continents that didn't quite stretch from pole to pole (I mean, on earth there's not really any tundra in the southern hemisphere), that would at least have less space for barbs to spawn.
I still wish they could come out with a form of spherical tiling. Even if the pentagons weren't identical sizes, and you made the pentagon tiles as a form of un-passable terrain (ice, mountain, bermuda triangle, etc...), you'd seriously reduce the amount of ice in the world and then it wouldn't matter nearly as much that tundra tiles sucked.