I don't understand the negativity. I really spent a lot of time with EQ, but MA1 just gave me the best results. (I have not tried the new Dirac ART yet). Also, as far as i know, Genelec does not have a real 310 competitor. (i think the 8341 is too different). The 350 will be placed against the 8351 though. I don't care for the 310 II, but i expect the 350 to be an almost perfect speaker for almost everyone. I don't know it and i have not been to the listening event, but simply because of what Neumann managed to achieve with the 120 II vs 120 and the 150. The 420 is way too big for most private rooms, even if it were cheaper it is not really attractive for a lot of people, i think.
If my expectations are correct, the only competition for the 350 will be the 8351 and maybe the Mesanovich CDM 65 or much more expensive and sophisticated systems.
All three will have their own pros and cons, but i expect the 350 to be at least the best of the bunch in terms of bass. Also, personally, i just don't enjoy the Genelec sound, so i think it is good to have more options.
I mean, the 350 could be an absolute dream of a speaker with very little disadvantages, for well below 10.000 EUR, or something like half of a D & D 8c.
BTW, the "plastic" comment almost makes me angry. I have both the old metal 120 and the new 120 II and the new model is so much better in every way. I think they almost did wonders in making an already good products much better, and people are moping about "plastic"...