As a former subscriber I can point this out:
One gigantic error: they have not seen the 2007/2008 crisis coming.
Their policy recommendations are always the same: "cut red tape", privatize, remove tariffs..., and this mirrors their ideological beliefs, not any hard won expertise.
They are also in denial about the unfolding ecological crisis.
Look also at their job ads to understand with whom they are aligned.
In sum, The Economist is a propaganda paper, that is well written, informative even if you can remove their rather obvious slant.