It's a matter of taste and synergy with other components, as it has been said. I feed my MC275 from a Lamm LL2 and drive B&W 804S with it, plus a Rel sub. I listen to all sorts of music, including Motorhead, Rob Zombie, AC/DC...you get the picture, and also jazz, vocal, and classical. I enjoy it all round. Should I drive my speakers with a Krell amp, my system would likely have more slam. Yet at the time I was deciding I preferred the 275 vs others, including the 252. Changing the tubes made a huge difference, as has been said. I don't know if I would call it polite...there are some CDs I cannot listen to because they are so poorly recorded.
My two cents!