Lorettagrace thanks for sharing your thoughts. Sounds like you are a tutor who is new to gmatclub?
I agree with everything you mentioned, with one little exception.
I have prepared for the GMAT for a while and can attest that a big majority of quant questions are challenging and not straightforward. One can only go so far using formulas and memorization. Quant questions in the GMAT are often based on concepts which one needs to master to excel and solve a question in 2 - 2.5 minutes. The GRE quant questions, however, are not so difficult, at least in the official prep materials. I have started solving the GRE questions from the ETS Official Guide few weeks ago and was surprised that only hard questions occasionally gave me hard time. This was not the case with the GMAT quant questions, at least for me.
Perhaps, I have mastered majority of topics and do not feel surprised anymore whenever I see a new question, but I cannot explain a massive drop in my Quant score on the "at home" GRE. This is despite the fact that I have scored Q167 on the free practice test. Even when I got a lower quant score on the free practice tests, my mistakes were careless (e.g. 12*2 = 48) and not because I was challenged by most of the questions.
Frankly, many questions in the real GRE felt "GMAT like", meaning that questions were not as straightforward as they were in the official free practice tests. This is my 2 cents.