Jorah having greyscale and touching people, including Dany, left and right. Why?
It's never explained in the show exactly how the disease is transferred. Shireen has it too, and she's touching people all the time. I'm guessing that, in the novel, she can touch people because in her case the disease could be contained, whereas it is still 'running' on Jorah's body and the stonemen's. But that doesn't make it a logical inconsistency, just a small deviation from the books. It could easily be that touching other people isn't dangerous in early stages - in fact, that's what I had assumed instinctively. I never thought that Jorah couldn't touch people anymore.
Naturally he also survived being pinned to the ground without a weapon because why would you watch your back in a last man standing fight to death?
Dunno, being stabbed from behind in a tournament didn't break my suspension of disbelief, but I can see your point.
THE FIGHT SCENE AT THE END. Where were all their throwing spears once they surrounded Dany?
Okay, this is the only point where I think I agree with you, although I was too invested to notice it at the time.
Did they go to the same fighting school than James Bond villains that only allows attacking one at the time after you've surrounded your opponent?
Attacking at once would certainly have been the strategically superior decision - but whoever attacks first is probably dead, and they're not elite warriors, they're a bunch of fanatical rebels. I mean, I don't know enough about mass psychology in fight situations to make an informed judgement, but to me it made a ton of sense. I would've certainly listed it as one of the great things about the episode.
And for that matter, for such elite fighters, the Unsullied sure never seem to win any fights.
Well, I'm assuming this isn't a real complaint, they were largely outnumbered and it's made pretty clear during the last two relevant fight scenes that one unsullied is worth more than one son of the harpy in direct combat.