i can’t speak for how mm compares directly to a nord g2 or axoloti (maybe others here can?) as i don’t own those, but i can say it can do some pretty powerful things. there are certainly cpu limits but the mm’s audio rate can be turned down to as low as 24khz to help with more complex patches. here are some posts to examples of some complicated patch examples:
the mm’s cv resolution should be whatever the audio rate is to on the mm (24khz, 32,48,96)
and the mm can most definitely process incoming midi and send it out to other synths. you would maybe need a usb-c→din adapter. there’s quite a few of them listed here
sadly patches can’t be changed yet by incoming midi but that’s been requested here - i hope to see that feature in there at some point