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's promising 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 Neill 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."
Disappointed Blades manager David Weir was also cautious not to promise too much and views his team as a work in progress.
Weir said: "Rather than saying what we're going to do and what we're going to get, I just want to improve as a team.
"There are aspects after this we can improve on and that's where we'll start on Monday morning.
"I'd much rather concentrate on the short term and get the balance between everything right before saying what we're going to achieve this season."
Weir does not see his relative inexperience as a manger being a hindrance to his side's development and believes the entire side will learn from their mistakes.
"It doesn't matter how long you've been a manager, you're always learning and I learned here," Weir added.
"There were a few positives and negative things to come out of it.
"We did well to come back into the game, but when you come here and lose three goals, it will always be difficult to win."