Exclam! Generally a good move, perhaps even unexpectedly so. Double exclam, !!, being a brilliant move, especially one with flair like a sacrifice. Triple exclam is reserved for the games of Emory Tate. ;)

Emory Tate must have been extraordinary..?

More like Extraordinary!!!

Nope, it means "good move". Check is +

It's similar to English actually. It's commentary, rather than semantics.

! is good move.

? is dubious move.

If you want to carried away double/triple those.