I don't see the big deal. MMX is a good game, and I enjoyed it. I wouldn't want DLC for it or to replay it much, but I enjoyed the heck out of playing it. I'd much rather see an MM XI done in an engine that didn't feature such horrendous performance and load times.
It's kind of funny. Back in the "golden age" of PC games you would be lucky if a game got a couple of patches in the first few months after release and there was about zero communication or interaction with developers. Now-a-days, especially with indies or smaller companies, games get often get way more post release support and even free DLC or major feature/content patches, and devs are often way more accessible.
I don't see how anybody could feel slighted on MMXI. Some things must come to an end. In this case, I think it's for the better, especially if there's hope of another similar game done even better.