I did tried to log in a while ago with my blockchain.info wallet and it's working.
I heard about DDOS attack to some wallet sites.Maybe that is the reason for unaccessible wallet concerns. Did you check to open browser's incognito mode which works flawlessly without old cookies? I hope you dont hold all your bitcoins in single web wallet.
Well these DDOS attackers seems to take the advantage because of the price increase of bitcoin. But I know they won't be successful on their attempt. And as of checking now again my wallet was easily logged in.