Sure, and that's kind of my point. If we're only willing to sign a kicker who's been "proven" in conditions as poor as Lambeau's....then we've pretty much restricted ourselves to signing only former Packer kickers.
As far as available kickers who have some experience in bad weather - and often very cold conditions - I don't think there are many better options than McManus available to us right now.
I think it was a good signing too. He's got a long leg, and has a history of kicking those 50+ boomers. Granted, a lot of them were in the thin air of Denver, but still, watching his kicks so far, you can see the strength. Another thing I like about him is that he doesn't rely on a hook or slice with each kick, or end up with kicks going in either direction. His kicks travel in a fairly straight line, meaning there's only an issue of windage he needs to consider, not worrying about how much of a hook he's going to get at the same time.
So far, in two games, he's hit the kicks we've needed, and it's been a while since we've had confidence in someone making those kicks.
Do I worry every time he boots it? Yeah! But I would do that with anyone back there. Especially in GB, where the winds swirl around and can be going in the opposite direction of what the flags above the stadium indicate.