I don't really believe in winning on a personal level. This is meant to be a team thing and I've never seen a mafia game won by a single person. Yeah, it's awesome when you're one of the last alive on the winning team, but it really comes down to whether you did something. Compare The Christmas Mafia 2011 to The War Room Mafia 1. I consider myself a winner of both games, despite the fact I survived the first, but died in the second. The thing is, in TWR Mafia 1 I was teamed up with a couple other people. We collectively pulled of a strategy that allowed us to win, at the cost of my life. I was willing to take a bullet for the team if it meant that we would win. And we did. So I now consider winning to be, "did you do something to bring your team to victory?"
On the topic of Day 1 lynches, I usually stay away from them. Too often I see valuable and useful roles killed off because people randomly start going for the "spray and pray" approach. Now, if someone can convince me in-game that killing on Day 1 is useful and can provide an acceptable target, I'll usually follow along. But I'm not usually one to point the first finger. I want to have some little thing to work off of first.
With massclaiming and name claiming... I have problems with massclaiming. Mainly, it doesn't work too well. Especially since the people that do claim to one person put their faith in that one person. It is so easy for that person to die with that information unshared, or for that person to be mafia. I never go along with massclaimings. Usually they're a bunch of lies.
Name claiming is another matter. I allowed nameclaiming in all three of my Falconwing games because until the last game no one had the information available to weed out fake names. You could literally call yourself anything and get away with it. Sourcandy's role in the third game was to catch people doing a mass name claiming and call them out on it if they lied about their name. That is... not how she used that role.