Blades boss Nigel Clough felt his side should have won at Oldham Athletic on Tuesday night, despite a lacklustre opening 45 minutes at Boundary Park.
Substitute Chris Porter scored six minutes from time to earn United a share of the spoils, after James Wilson had given the Latics a half-time lead.
Analysing the performance of his side, Clough remarked: "The second-half performance was good, but the first-half was neither here or there, it was like an end of season affair and we don't like that.
"But the moment we stepped it up after half-time it was constant pressure on Oldham's defensive and like at Port Vale we should have gone on and won the game.
"We have shown some character on the road in the last two matches. We have come from behind in both games and taken four points so that is pleasing., but we shouldn't have fallen behind in the first place."
The Gaffer also acknowledge United need to improve in the attacking third of the field, adding:
"Again, we just lacked that bit of quality in the final third, we are very good until the final ball, but that is something we will work hard to address for next season.
"Even during the good performances we have known the need for a focal point in attack, that has been the case for three or four months now."