The phrase "a bit perfunctory" is correct and usable in written English.
It can be used to describe something that is done with minimal effort or care, often in a routine or superficial manner.
Example: "The presentation felt a bit perfunctory, lacking the enthusiasm and depth we expected."
Alternatives: "somewhat cursory" or "rather superficial".
But Brooklyn feels a bit perfunctory, maybe a little stale (everyone apparently knows everyone in Brooklyn).
He was pleasant, but a bit perfunctory with his two guests, the movie actor Seth Rogen and Lea Michele, a star of "Glee".
It's not perfect – the storyline is a bit perfunctory, its free-form style can be illusory when it forces you to perform certain missions and it gets a bit repetitious in the latter stages.
It was a fine gesture and beautifully executed, though — shorn of its sectional repeats — the piece sounded a bit more perfunctory than it needed to be in a relatively short program.
Situated on the Arborway, a busy overpass that Olmsted foresaw as a tree-lined link between Franklin Park and the nearby Arnold Arboretum, the installation lent a bit of perfunctory nature to one of those pedestrian no-man's lands that modern cities spawn.
Aside from a bit of perfunctory TV coverage, the only Americans likely to be familiar with them were gays themselves and anyone who watched The Laramie Project.
At the opening of Sen. Hillary Clinton's confirmation hearings for the post of Secretary of State on Tuesday, the ranking Republican on theSenate Foreign Relations Committee offered a bit of perfunctory praise for the former first lady.
The murder is solved in a bit of remarkably perfunctory plotting, while Aaron and Krista play out the long-suppressed sense of entanglement that is Oates's true plot.
Whitehall leak inquiries are notorious for never achieving anything, but this sounds as if it's going to be a bit more thorough than the usual, perfunctory, "was this anything to do with you?" ring-round by the permanent secretary.
It was her tiny bit of luxury, a bit of beauty, in a very perfunctory life which was filled with functional things.
Romney, appearing tieless at what was supposed to be a victory rally in Colorado, offered perfunctory congratulations to Santorum, engaged in a bit of dutiful but uninspired Obama-bashing, and signed off by saying, "We've got a long way to go".
