Can't help you on RM2 rules.
Traditionally werewolves are written more as horror. It's uncontrollable, they're monstrous, and they're also powerful enough to be a real threat on their own. It's hard to achieve that fear in an RPG where the PCs are used to dealing with monsters and they might see it as a source of power rather than horror at what they've done. If your goal is horror, I would say tell the player as little as possible. Don't let them know what the threat is. Hint that something is wrong with them. Let them see the damage that has been wrought before they suspect themself. Hurt or at least terrify NPCs they care about. As soon as the mystery is gone and it has a label, it will stop working as horror, so you have to take advantage of that stage as long as you can.
If you want to tell a story about lycanthrope culture, the things they fight against, earning a place in a pack, etc, forget all that and play up the experience. Seeing things through the eyes they can't yet control is part of earning their place and seeing what they are trying to gain. Totally different story, equally valid, merits a different approach.
So make a decision based on the kind of story you are interested in telling.