I just got completely caught up on Pact. I can't say I'm in love with it. I generally prefer my urban fantasy to be more along the lines of Dresden or the Iron Druid Chronicles, where the "fantasy" is pretty clear cut and follows clear rules. Maybe i'll get more into it as it goes on, but so far, i'm still really disappointed it wasn't Boil.
And narphoenix, i think Sanctaphrax was referring to the fact that attaching stats to the Endless is beyond pointless because they're both so far beyond gods it's almost a joke, and their powers are nothing like clearly defined. That combination means that attaching any kind of stats to them, especially with a ruleset like the DFRPG, would be monumentally difficult. To use your example, if I had Mother Winter appear in a game, i might give her a skill set and maybe a few stunts, but I wouldn't even know where to start with powers.