We bought Higuaín because we were severely lacking a world class CF. Also imo it's nonsensical that some claim that we would've won Serie A this year without Higuaín. We played below par for many games in the league last season and were bailed out by Higuaín's individual quality.
Higuaín's performance in the CL was satisfactory. I remember when Tevez came here and he was atrocious in the CL in his first season but performed way better in his second season. Let's not judge him based on one season where he was a record breaker anyway. I think he could improve even further this year because the support cast will be much better now compared to last season.
It's also that some people are too nostalgic about past teams (too many Pogba and Morata fanboys) and too bothered about his price tag (again not his fault ) , that they need to bash him incessantly either for his appearance or for his choking past. He definitely dint choke in the final btw.