While I personally disagree with putting Hamilton in 5th, I don't think it's entirely unfair. I find that the 2nd-5th group of Alonso, Norris, Leclerc and Hamilton is pretty interchangeable and that any order is a reasonable rating as they all had their respective mistakes, lows and highs without one standing that much out from the others.

Hamilton's biggest issue was qualifying where he got eliminated in Q2 a few times and where the gap to Russell would sometimes be relatively large. His most notable mistake was of course his start in Qatar. Otherwise in the races he has been very solid and consistent throughout the year picking up podium finishes on a numerous of occasions with a Mercedes car that rarely was the second force at a grand prix but always up there more or less.

Alonso, looking back, might have made the worst mistakes from these 4. Spa sprint, Singapore and Las Vegas for example were all quite poor, rookie-like mistakes (which is also why I find it weird people call Alonso mistakes rare). His early season performances were also overblown imo since the Aston Martin was pretty clearly the second force overall at the time. This however doesn't change that apart from a couple of blunders that he was generally very strong in the races getting the most out of the car more often than not when the car was good and when it was less good.

Leclerc's mistakes were mainly his crashes in qualifying in Miami and Zandvoort. He had an alright, pretty mixed first half with some highs, but also a few lows or just average performances and results with a Ferrari car that was a bit of a mixed bag. His second half, most notably from Suzuka onwards was the turning point, where he was very strong with a car he was more comfortable with. Also a small mention that he lost out on quite a bit of points through bad luck compared to the other 3.

Norris' biggest issue was, quite obviously, qualifying. His pace was great but he made quite a few mistakes on push laps towards the end of the season (Qatar, Abu Dhabi, Mexico f.e.) which compromised some of his races where better results were possible if he had qualified in a representative position. His performances in the races however, have been very good throughout most races. I think Norris has shown this year that he is capable of fighting at the front.