"The softness of the goals meant that the scoreline flattered them," said Millen.
"We were losing, so pushed more men forward and they did us on the counter attack.
"We're bottom of the league, but I will continue all I can to prepare the players. My position is out of my hands, and it's not my decision, but I will continue to fight on. To lose 5-0 isn't acceptable.
"I have been trying to get players in for a long time. I have had confidence in these lads for the last 10 games, but we're just not producing at the moment.
"We're getting a lot of criticism at the moment, and I am taking the majority of that, which is quite right, but the players have to stand up and be counted now."
"The lad (Jonjo) Shelvey has come in and done well," said Blackpool boss Ian Holloway.
"It's been a long time coming, getting him to this club, but we've finally done it, and he's repaid me.
"I wanted him when Charlie Adam went, but we just couldn't do it at that point, but now I have got him, and I am pleased about that. I've not seen many better debuts than that.
"We played a new way today, and it has worked for us, we were a bit disjointed early on, but we got into the groove and showed how well we could play.
"We got the goal, and like on many occasions, that made the difference and we took the momentum from that.
"I made the triple substitution as we looked tired, and they lads have come off the bench and done the business for us.
"I feel sorry for Keith [Millen], he's a man with a lot of dignity and he's doing his best there, but they're struggling at the moment, but I think he can get it right."