Doesn't deserve a 4.8 ...
The film definitely isn't anything special. He has many flaws and could have been told more entertaining. Nevertheless I thought the film still had his moments and overall was enjoyable, the cast was also great. I would give it a 6 / 10 and I guessed the average rating here would be between 5.4 and 6.0.
4.8 is too low. I think the reason people gave it such bad ratings is because they had very high expectations regarding the director and the cast.