Rosler watched new signing Will Grigg bag a brace on his home debut as the Bees chalked up an impressive victory.
But despite his side'spromising display, Rosler says there is still more to come and sees it merely as a good platform to build on.
"It was a very satisfying, solid performance. I wouldn't call it great, but it was very good," said Rosler.
"It was a very important game to know where we are at and I think we've got some answers.
"There's still a way to go to integrate all the new players in with the style of play, but we've shown some promising signs, especially against a good side like Sheffield United.
"The four points and one win in the cup is solid and it's where we want to be - no more, no less. It is solid and good, but not more than that."
Adam Forshaw curled home the opener with 35 minutes on the clock but, after Blades defender Neil Collins had levelled things up from a corner, Brentford took control and were good value for their win.
Rosler was particularly pleased with new signing Grigg and said the former Walsall striker should not be too downbeat after missing the chance to grab a hat-trick when his late penalty was saved by George Long late on.
"Grigg never stopped working, he's very fit and has intelligent movement," said Rosler. "That's what attracted me to him.
"He got his rewards by scoring two and I think the penalty was taken very well too, but the Sheffield United goalkeeper made an outstanding save."