I think he's doing OK. A few mistakes, understandable with everything else around him (Race of Champions, demo drives, testing for Ferrari and Alfa, etc).
I thought this weekend he was good (ironically this was one of Michael's worst tracks). He had a problem with a car in race 1, but even a lap down with no hope and he was on pace with the leaders. Race 2 was obviously compromised by race 1 (starting in 18th) but he was still 0.2s off a podium at the end - had he started near the front he might have been right up there with Sette Camara and Ghiotto.
Let's face it, Norris went off form last year when the McLaren promotion talk started - he didn't look great in the second half of the season, yet he and Russell are looking very good in F1 at the moment (hard to tell with Russell admittedly, but he's doing all he can in beating his teammate).