The really hard part about comparing it to other people's drinking... is there is no "normal". If you look hard enough, you could find someone who drinks more - "OH, it's not as bad as that! There's nothing to worry about until it gets to that point." And you could find situations that involve less drinking, "Geez, it's worse than that! I should be concerned!"
I remember coming on here 6 years ago, reading some posts and saying, "Geez, I'm grateful my husband doesn't do that!" But alcoholism is progressive, and gets worse without active recovery... and now, I find myself typing my story and knowing that someone out there is reading and saying, "GEEZ! I'd never let it get to that!" But you do. It sneaks up on you.
Functioning or non-functioning doesn't really matter. The degree to which he drinks doesn't matter either. What matters is that alcohol is causing problems in his life. He can't control it, and neither can you.