Felipe to United would not make a lot of sense, especially for £30 million+ - because for that amount of money, and in terms of being a January signing, the expectation would be for him to make an instant impact. And he's far too inconsistent right now to be able to do that, especially when transitioning from the Seria A to the Premier League. In terms of his potential over the medium term, Felipe would be a quality addition to the squad, and maybe even become a big long-term contributor - provided we develop him properly and place him in a system which would bring out the best qualities in him. To the arguments about him being a nothing player/ worse than Young, the videos have done him a disservice; plus, he's underperforming this season - Stefano Pioli has mismanaged him repeatedly, a lot of times he has made him a space goat for the team's failing as a whole, the player reportedly doesn't get along with him, Di Marzio said he thought he was leaving Lazio but had to stay because the deal fell through, etc. All of that is having an effect on his performances when this was supposed to the year when he progressed to another level, after the fireworks to close the previous season out. Youtube compilations aren't the be all and end all for gauging someone's talent - a quick browse through of Di María or Hernández's tepid body of work under Louis is testament to that.
In terms of what he could offer - he would add deadly pace, dribbling ability and goals from wider areas (which is what we need right now). More of a momentum based dribbler than a wizard in tight spaces - he can outrun most players but needs some space to operate in - so ideally suited to a counter-attacking setup like Leicester where he'll have room to operate in on the break, than a possession team where he'll be asked to be a quality passer in the build up and probe defenses. Also, he is almost exactly the type of player Van Gaal detests with all his might - not one for adhering to strict tactical instructions, temperamental, cocky, can give the impression that he knows better. Flashes immense potential in one game, then blows cold for the next two - sometimes you wonder how he is even a professional footballer when his form is bad - overall he's very much a work in progress and not what we need. More of a Fergie type of youngster - a little fragile mentally, someone who needs an arm around the neck from time to time, to be reassured, and given the license to try things until he finds some consistency. Van Gaal will see an inconsistent Brazilian who needs to be infused with automatism, and completely ruin him by limiting his movement, individuality and impact on the game. Think it's best for both United and Felipe if we don't sign him.