I owned a lot of audio equipment and still have a few pieces including McIntosh. I liked them and always liked the sound.
It's on the warmer side for sure and not as open as some other gears but very musical and good for long listen without fatigue.
Currently in my system I rotate the following preamp:
McIntosh C38
Mark Levinson No 26
Krell KRC-2
Inex Innovation fiber optics preamp
Marantz 7
They all perform differently and C38 compared to the rest is the most non-fatigue one. Quite musical.
As for the power amp I rotate among:
McIntosh MC7100
Bryston 4BST
Canary Audio CA300 mono blocks
Sonic Frontiers Power 2
Threshold CAS2 Monoblocks
Inex Innovation 8W power amp
I find McIntosh right up there with the rest of the them.
In my past, I've owned McIntosh MC225, MC240, MC275, MC250, MC2100, MC2120, C504, C20, C8, MC20W2 all of them are very good.
This is comparing to the other amps I had such as Spectral DMA50, Audio Research Classic 120, Classic 30, D125, M100, D100, D76 which I owned and also Krell KSA80B, Counterpoint SA20, PS Audio P200, GAS Ampzilla, New York Audio Lab Moscode300, DB6M Conrad Johnson Premier 7, Premier 3, Premier 2, PV6, MV75, Marantz 8, VTL Deluxe 120, First Sound Preamp, VTL Ultimate and among other things that I've owned.
I can say that McIntosh is as good as anything I owned and heard and they are lovely.
But the draw back is not as open or clear and not as attacking compared to the list of the amps I had.