Yes, yes they have. Download a mix in the upper 1000 and compare it to one of the first 500.
Now, I'm not sure if someone sent you the rejection letter, or if it was just automated, but I don't think they meant 'ALL' of those reasons are the reasons it wasn't accepted.
However, I could be wrong.
I don't know the original, so I can't compare, but the first 1:45 is verrry dull, minimal, basic, boring, simple, etc. etc. The next minute is a bit more exciting, but even then that's not saying much.
You samples, regardless of what you used, sound very flat, very gamey (for lack of a better word). There's no strong features to them. Some mastering/processing of them to bring them out, and have them sound stronger could help.
So yea, the jdgfgts are really anal about interpreting the mix into something different, while keeping the original recognizable, and having good samples are a must. (even if they cost 5, or 500 dollars, better to sound real then sequenced).