First of all, there clearly needs to be another poll to vote on possible meanings of A+!
Relative to my expectations at the start of the season, I'd give the Caps A+, and I suspect very few fans expected them to be this strong overall, not to mention the record.
Off the charts: Schmidt
Well above expectations: Chimera, Wilson
Above expectations: Orlov, Chorney, Williams, Beagle, Mojo, Kuz, Holtby(?)
Below expectations: Bura
I mean, something like 9-10 players outperforming expectations and only really 1 underperforming is pretty insane.
In absolute performance terms, I'd give the Caps an A, where A+ would be some "generational" team. At the same time, A+ for finding ways to win close games.