What do you think it is if not centrist? It's certainly not solidly left-wing and it's certainly not right-wing, nearly all of its reporting (excluding the insert magazines like the TV guide and food mag) is pretty firmly liberal capitalist centrism with some token left wing bits in there very occasionally.
As someone who reads the paper a few days a week, probably only a quarter of their output is opinion pieces, which I'd say is a pretty standard ratio.