Seriously. The best keyboard ever made? Not hardly. I can think of three massive issues:
1) Key activation force. You have to push quite hard to activate those key switches. That is unergonomic and contributes to developing RSI in many individuals. A good keyboard should have a light key activation.
2) Keyboard shape. The straight keyboard is not a good shape. Our hands don't naturally sit straight, neither should our keyboards. Again, this is an ergonomic issue, being your wrists like that can lead to RSI. A good ergonomic keyboard can be adjusted to match the position of the user.
3) The noise. Those springs are loud. Makes it very annoying to use in an office environment, and unsuitable for quite environments like a studio. A good keyboard has dampened keys that don't make noise.
Well, turns out you can get good keyboards like that. Matias, Kinesis, Maltron, all make really good keyboards. They solve the problems that the Model M, and others, have.
Even if you don't believe you'll ever suffer from RSI (and that's a bet I wouldn't make) you will probably find your typing speed increased by lighter keyswitches.
This Model M worship needs to stop. It is old technology, we have better tech and a better understanding of how to make good human interfaces devices these days.