Lol.
Firstly, I didn't say that you need to learn English, I said as an English speaker you need to understand connotation. If you're equating understanding connotation to speaking good English, then we're on the same page.
(that was a joke)
Your argument about moderate only reaffirms mine. It is no longer good enough to be moderate, also defined "avoiding extremes in behavior or expression: observing reasonable limits". In other words, neither the best nor the worst yet now the word's connotation leads it to also mean not very good instead of just good enough.
Language grows, moves, and even shifts, as we do the same. We no longer speak like the people who came before us. One example, gay. It has gone from meaning happy, to homosexual, and to a certain degree, bad, unpopular, or awkward, like; "electric cars are gay". (not a sentiment I agree with). Other examples include the term 'down low' and when it was cool to say 'waaaaassssuuuppp'. This is why linguistics exists. Because languange changes, and people study and record those changes.
Gimmick is an unflattering word, and MORE IMPORTANTLY, in the context of the discusion we were having, it was being used in a disparaging manner, and that is what was being discussed; whether the addition of 3D to the DS line was simply a useless add-on, or worthy uprgrade.
I mean no animosity or arrogance in my posts, so I don't know why you're taking this so personal. It's okay to disagree with my opinions, but connotation is a fact of language. It's not like I just made this up for the sake of argument, it is what happens to our speech, even in a single sentence. How you say something or the context of a word in a written sentence can radically alter its meaning, and in this case, it's really not all that much a radical altering, just a slightly negative connotation.
Saying something was done solely as a differentiating factor between competition, is a lot less flattering than calling it an industry changing innovation; like the Wiimote, and DS touch controls are.