Two things:
1)Number of games
I think we already have too many. The forum threads are already borderline annoying to the rest of the community who isn't participating and we don't want to alienate them. Secondly, what makes the games great is lots of people participating in the commentary thread. SoW2 already only has one person commenting whereas SoW1 has had 6 or 7 people comment, SoW3 has at least 2, and SoW4 has had two or three people commenting. I feel kinda bad for the rookies in SoW2. Stratagos has done a great job, but I feel like the rookies in my game aren't getting the feedback that they need to improve.
2)Specific Moves
The point of this is to teach people how to play, right? Well, mastery of tactics is a HUGE part of the game and is often overlooked in my opinion. There are many moves (especially when you want to defend a territory) that are overlooked by rookies. I think that it is ok to discuss specific options that a player has, but it is definitely not ok to say what a player SHOULD do. In thinking through my own comments I have probably violated that principle once or twice. I think it is ok to phrase things like this, "If I were player X I would be worried about that alliance and I'd probably try to protect this territory. Here are some possible ways it could be protected..." Something like that doesn't cross the line. This does however, "Russia you need to move Sev-Bla, Bul-Con, GoB-Swe, and StP-Nor."