To me there are two different ways to look at a tie in a game like this one. From the Cardinals perspective, it's like a loss, because they outplayed us and honestly, should have one many times over. Being already behind, they needed the win a lot more than we did, so this one stings for them.
Looking at it from a Seahawks perspective, we lost no ground on any team in our division and gained a little ground on the Rams and Niners. Winning the division is first and foremost and this tie helps that cause. As far as NFC seeding goes, it makes the likelihood of a tiebreaker very unlikely, because to have an actual tie, the team we are matched with would have to also have a tie this year and ties just aren't that common in the NFL, so if you look at the standings right now, the same two teams (Cowboys and Vikings) are ahead of us, but they play each other on December 1. Assuming they don't tie, that means one will lose. That team will have one more loss than us (assuming we get back to our wining ways). This means that as of right now, we basically control our own destiny as far as getting a first round bye goes. Even though we are technically in third place in the NFC, if we continue to win, we'll be in 2nd after December 1.