I'm a french player, and, to begin, here is a review of the first "Monster of the Week" game I ran : http://www.gulix.fr/blog/?article237
I took the scenario "The Red Ghost" from the "Supernatural Adventures". I like it (second time I was running it) because of its twist about the nature of the ghost. The game went well, but I came across some "difficulties".

First, I think I asked too many rolls. At the end, one of the player (The Disciple) told me he could have marked almost fifteen experience. He wanted to test this system, and was always "helping out others". Do I need to ask my players to run "Investigate a mystery" at each location they search ? In this case, there was at least 4-5 times, for each player.

They also made extensive use of the "Use magic" move. I tried to balance it by asking components, and making nasty second effects. But they wanted to use it for many things (mask their presence, follow trace, see the past, ...). It's partially my fault, cause I didn't put limits in the beginning (I wanted a more "physical" approach).

But all the players and myself were happy of the game. And we all want to put it in motion again. Thanks !