Extra-wide baffle speakers are better able to convey a sense of the recording space compared to "normal" and "skinny" speakers in most rooms. My favorite example of this is the Sonus Faber Stradivari.
You can get more insight reading Troels Gravesen’s article on a "poor man’s strad" here:
http://www.troelsgravesen.dk/PMS.htm
Besides that, one thing that bedevils a lot of speakers is baffle diffraction. This is not just the baffle width, but the height and the driver placement. For whatever reason, wide baffle speakers seem to cure a lot of it.