Why the hate for mcintosh amps?

@samzx12  

I can change the tube,there are several brands on the market, prices is different,and I will choose the good one I think.but I will never ever choose the NOS tube the price is  completed different from the new tube on the market. For example,300% or 400%.

If the amplifier get the good sound depend on such  expensive tube, it means the design has problem.

Definitely agree it should sound good without NOS tubes but if it sounds better with them and they are priced reasonably then why not.  Improved the sound of several preamps and amps replacing the stock tubes.  Primaluna is one example but I won't pay ridiculous prices for NOS. Have noticed in the past couple years certain NOS tubes have become extremely rare. 

Are mc611 monos good.  Thinking of getting mc2301 tube amp monos.  Good idea?  
 

being used for a pair of b&w 800 series speakers.