To my ear, and units I have kept, the 2275 and 2325 are really nice. Personally, I wasn't that impressed with the sound of the 2500, 2385, but that doesn't mean much: a lot of people love them!
All Marantz receivers are pretty great, even the smallest. I think the models that came out together in 1976 (?) which included the 2250B, 2275 and 2325 is a hard group to beat for well rounded sound, and build quality. Also, whatever the Marantz sound is, I think most here would agree that it is tends to be a little warmer, and many of the favorites are different shades of that house sound. Anyway, that is how I view it. I was selling them at the time, and later models like the 2252B, 2265B and other "silver" tuner facia models really did seem to move a little toward a brighter sound: it was a noticeable change. At the end of the day, just as Steven said above, it all depends on what you team them with, your room, and individual taste.