The Hammers were comfortably beaten 2-0 at London stadium.
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O'Hara said on talkSPORT: "What am I watching? They are one of the worst teams I've ever seen in the Premier League.
"This has got to be probably the worst West Ham side I've seen in the Premier League.
"I've played in charity games at West Ham, mate, honestly, I could have played tonight.
"You watch my highlights from the charity game when I played there about three months ago, that was Jordan Henderson.
"Like literally, no one's near him. He can do what he wants. Any player can just sit there and string a ball about and look good, but there's no one tackling you.
"I couldn't believe what I was watching."