For me Pd is totally outstanding, even more with the Cleveland/Cincinnati spaghetti reports.

The Gui is ok, perhaps more than ok, as it is. When you are patching you always change things, and the final visual effect is irrelevant. Also straight cables (or unsegmented) are clear to follow. This minimalism, I guess, is simpler an cheaper to maintain, that makes it even better.

Help files are ok.

It`s well documented.

Works on windows, mac, linux, etc.

Limitations are that Pd-extended is no longer updated, also that Pdvst by J.Sarlo is no longer updated. Both of these form a door in which beginners enters “Computer Music” and “dsp” with Pd.