I totally see what you're saying, and it can be construed as copying, but I totally fail to see what the problem is. I find cries of copying are extremely hyperbolic, and it's not just coming from you. This industry, and many others, are built upon the foundation of successful ideas of others. In fact, everything, everywhere is a remix. I also don't believe that purely based on the quality of a product, that it should be completely shunned and forgotten about. Like AtGames' product, it has just been revealed that the licence has been revoked and I think Sega are developing the product in-House. When the newer version releases, it can, should and will be compared to the older version. Therefore doesn't deserve and won't be forgotten, not quite yet. I find this aspect kind of disingenuous.
I never had an original genesis. Me and my flat mate in college had tons of fun with the ATgames Genesis. I got way more use out of it than I have has with the nes or SNES mini.
I think we just have different philosophies on life, and business. That's fine. You call it copying, I don't. We can agree to disagree.