Sat here for the Cincinnati Bengals vs. Seahawks game in 2011. Not only does 303 give you a great glimpse of the North end zone but if you look to your left you can see bits of Safeco Field and if you look to your right, you can see bits of the Seattle skyline depending on where your seats are. People say that there are no bad seats in this stadium and we all know that's never true.

If you sit in rows AA thru HH, you won't be able to see the field as well and will feel disconnected from the game entirely even as good as the Seahawks fans do at keeping other fans excited.

This place also has a weird design where you can be under cover and somehow still get wet from the frequent Seattle downpours. I'm okay with getting wet if you're sitting out in the open, but I expect a better protection if you're sitting under roofing.
I also like that the seats are individual seats and not bleacher style like the 'Hawk's Nest'. It's a little easier on your butt.

The only real drawback to Centurylink Field is the walk through the parking lot and up over the crowded skybridge to get over the Sounder train. It will take you a good 30 minutes sometimes so leave your tailgate in plenty of time.