The League One side collected a 2-0 victory in a match which saw the stadium floodlights turn off three times.
Howe made 10 changes from Friday's win over Southampton, but believes the Cherries should've still got the victory.
He said: "I see it as an opportunity missed every game you don't fulfil your potential and play the way you want to.
"It's desperately disappointing, we are kicking ourselves – we know we are a lot better than that. it didn't really show in the match.
"I think we lacked everything. We lacked quality on the ball, we lacked intensity off the ball, we lacked our usual swagger. Certainly, we will have a lot of reflection.
"I need to go away, watch the game and pick the bones out of it."
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