Career points are irrelevant as they changed over the years and there are more races as well.
He had 6 years with Mercedes. Roughly, around 60 of his 86 pole positions were with Mercedes in 6 years. he had 26 in 6 years with McLaren.
For me he is and as i said before, Schumi is as well. when you have a car that's destroying the field and doing the work for you and when the only person that can stop you is your teamate which your team has choosen to be more like your wing man than your competitor, the results that you get are flattering.
I'm not saying he's not good. he's one of the best of his generation. But you have to be a die hard Lewis fan to not see that his results flatter him.
The car no doubtly helps, but last year, both Ferrari drivers and the Red Bull driver (Max) beat Bottas so the car last year certainly wasn't "destroying the field". The driving of Lewis put pressure on his challenger, Vettel, and caused him to make mistakes. I'm not a F1 historian but I bet the previous world championship drivers all raced in very competitive cars. Has there ever been a driver who won a world championship with what was clearly otherwise a poor car?