Did he deliver on everything? Of course not, campaign promises are as much aspirational as anything. But speaking of concrete, he was part of the badly needed infrastructure package, which had reached the point of a joke under the Trump administration (infrastructure week!)
The issue with Biden is that he represents the greater issue with having different flavors of Capitalist parties, and nothing else, within American electoralism.
Leftists will never be able to be satisfied with a lukewarm liberal president, whereas fascists get to gleefully vote republican and have their views validated.
As such, elections are a matter of harm reduction for leftists, while meaningful change must be done at the grassroots level.
Actually, as a leftist, I'd say Dark Brandon has been one of the best POTUSes in recent memory. Just like Obama though, Biden has a Senate that actively shuts down most of his bills. People seem to still operate on this assumption that the Executive branch is a dictatorship.
Better than recent presidents? Yes. Actually a leftist? No, Biden is far from actually being a leftist. This more points to electoralism being harm reduction for leftists, not advocacy.
The executive isn't a dictatorship, and that's another reason why meaningful change must happen at the grassroots level, not via electoralism. The system itself is designed to be extremely stable, and thus slow to change, if at all.