Reading the wall of text that the OP posted. Whew, so many things to digest. But anyways here is my feedback to your feedback about the game so far.
First, calling this game “beyond disappointing” is just uncalled for. Yes it is not perfect, but “beyond disappointing”? This must mean the game is really bad, like Superman 64 bad. 
Second, I somewhat agree on the EXP gain, I do wish it will not be much more worse when the game is launched - don’t get me wrong, I love grinding, but I don’t think I can stand prolonged hours of grinding just to get one level.
Third, I do agree with the type of quests we get. For example, maybe we can have quests that involves puzzle solving, platforming, stealth/sneaking? Keeps the game challenging. As for the bosses, if IMC wants to recycle the bosses, please do so, but perhaps they can add different attack patterns for bosses to differentiate them? Especially if they bosses are at different levels.
Forth, the problem is if we do make a world like RO, with many many maps, most of them will be empty, because why? There will always be a “best” place to grind/level-up. You want to get the most out of your time grinding in a place where the map provides the optimal amount of EXP, and the monsters are not too hard too kill for your level. As for the part about the monster do zilch damage just because you are several levels higher than them… maybe perhaps you had a good equipment? 
Fifth, RO does the same, you get punished if you head into a zone that has high level monsters - it is much worse if the monsters are aggressive and can chase you down in a blink of an eye. I remember setting foot in Sunken Ship F2 and just getting murdered by the Penomenas there. >.<"
Sixth, are you referring about the EXP penalty a low level player is not awarded enough EXP for killing a high level monster? I do not mind this actually. It prevents players from abusing the system, where a level low level player can gain phenomenal experience just by killing a high level monster - I have seen this many times in RO.
Seventh, I don’t know about monster looks, but I think they look cute… those hanamings especially (so sad you have to kill a few hundreds of them just to get the black hair achievement) As for diversity, I think there is enough of them (but if IMC wants to add more please be my guest). I say this since I main QS, and there are certain monsters I prefer to kill since most of them is resistant to pierce damage 
Eighth, yes more map interaction is good. Please add moar IMC! Thank you very much.
Ninth, I think the difficulty (remember I main QS) are a bit easy, sadly. The only times I have died is when I get careless during boss fights, from stupid lag spikes, or just being an idiot and going AFK in an area which I think is safe but isn’t.
Tenth, I have not played far enough but I think they do enough damage? Of course if you are several levels higher than them (and have better equipment) they won’t.
Eleventh, I thought partying up gives bonus EXP? Unless of course that is a lie… =.="
Twelfth, yes I agree about your point on the stats. In other words, please use multiplicative instead of flat scaling stats.
Thirteenth, I agree to everything you said about the equipment.
Fourteenth, I will skip this part.
Fifteenth, agree about the town, I do wish there are more cities to explore - so far I have seen one big city, few camps and that’s it. As for the story, I will give it a 7/10. It is good enough but lacking a bit of that “oomph”. As for the reason there is so many forest maps, I think it is tied to the story? You know about the big tree suddenly appearing, and plant monsters, etc? Music is a-okay, I give it a 7/10 too, but maybe this will change later on in some of the higher level maps? Hopefully? Please?
Sixteenth, I am on the fence on this part. On one hand, I do wish you can get a different start depending on your class choices, however on the other hand, I don’t really mind it.
And lastly (finally I got to the end!) I agree with your point where an MMORPG must be fun from start till the end.
All in all I give this game a 7/10 (yes always seven)
