Can you please justify how Gmail, an Email client used by probably millions of users suddenly turns out 'un-drinkable' to the author (and to you)?
Can you send E-mails? Yes.
Can you receive E-mails? Yes.
Can you forward E-mails? Yes.
(^Note: This is a paid feature on other popular clients)
Can you read all the E-mails you've sent and received? Yes.
Are you paying for it? No.
So, how does this become 'un-drinkable'? Your e-mail was delivered despite the delay. It would be fair to call it undrinkable if your email wasn't delivered. AFAIK No one promised you they would deliver it within 'x' minutes.
For heaven's sake, it's a bug. People make mistakes, Softwares contain bugs, I'm sure with all your experience put together, you know this better than me. Why make such a huge fuss out of this? How does such a minor problem affecting only a fraction of Gmail users suddenly become Gmail's Second biggest problem?