I played this scenario twice on modeterate mode(but i don't think that matters).The first time i lost because i assigned a hotkey to Argo(the ship).That was of course not your fault,it's just a known bug of the editor(grouping nulifies armies).
I didn't encounter any serious problems except from a bug i found.On the second time i played it the cinematic with Circe never started,so i was left with the hero,one gatherer and no bolt.Some fixing needs to be done there.
Generally the scenario was a bit fun,but it lacked action.Most of the time the player only has to travel around,searching for people in order to talk to them and there isn't many challenges.Maybe you should make the map a more dangerous place for Jason.And it would be much better if the scenario contained the whole story.There would be room for much more action then.
I liked though that you paid attention to details,like using the drum soundfile when there were new objectives and using animations a lot.
Balance is the weakest part of this scenario.Simply it's very easy to win.All you have to do is keep your weaker heroes away from some conflicts.I'm no expert but i ended up winning with aproximately 20 units left over.You should definately add some more enemy troops,both on land and sea,preferably using different difficulty levels.
There were not many new elements in this scenario and the story is a known myth,but the way you made it into an AoM scenario was ok.I think the average rating is the most apropriate.
Map Design: 4
I think the map design was the best that this scenario had to offer.It was mostly a water map and it was nicely done.Good mixture of terrain and use of elevation,nicely shaped islands and volcanos and a litle desert island with monkeys :p.The city was nicely designed too,but it should have been larger.
The story was there,but it was very thin.You should enrich it a bit.But i reckon your native language is not English,so i know from my experience it's a little hard to write long stories.
The instructions were ok.I never had a problem understanding what i was supposed to do.It's one of the first times a designer uses the spotlight section of the instructions i think.But the photo of Arkantos there was completely irrelevant.Moreover the hints could be a bit more detailed.
As for the names of the heros,i believe "Argo" is mostly mentioned as "Argus" in English books.The original Greek name is "Argos".
All in all,it was an ok scenario.Although there is room for many improvements,it was playable and fun at some parts.There aren't many scenarios better than that out there yet.I strongly believe that you have the potential to create even much better scenarios :).