I regularly play with beginners in Face-to-Face games here in Australia. Although I wouldn't say that I go easy on the beginners, I play pretty differently to how I would play in say a tournament game.
The point of our FTF games is to bring more players in to playing Diplomacy, and ultimately build up a core base of interested players so that we can have regular, high quality games. If a new player ends up on the pavement with no centres and no idea how it happened in the first hour or two, then I don't think they'll be coming back.
Generally, I don't set out to win those games (because who cares if an experienced player can solo on a bunch of people who've never played before? That'd be ... pretty lame) - but I don't go easy, in that I try to practice other relevant skills at the table. Like, if I'm England, can I arrange an A/T on the other side of the board? What happens if I do? Where is the pressure around the board, and why? Obviously, I try not to die in those games, and I will make choices based on what's best for me given two options- but I'm not trying to get to 18. I'm *primarily* trying to get the game to a point where when it wraps, everyone says "that was awesome! When's the next game?" even if they were defeated.
THAT's the ultimate win in Diplomacy - have a game end in a solo (or satisfying draw), where everyone shakes hands at the end and says "see you next week, yeah?