For a while I never was very pleased with HP5+ shooting it mostly at 200 ironically following the suggestions of one of my photographic idols, Barry Thornton, however lately and I've dialed it in well using HC-110 at box speed:

Devil's Tower
9min 18C
by rich8155 (Richard Sintchak), on Flickr

And also shooting at 800 and using Rodinal has surprisingly given me some pleasing results too, never before liking it at 200-400 in Rodinal.

Jewel Lake with Ben
Ilford HP5+ at 800
Rodinal 1-50
13min, 20C
by rich8155 (Richard Sintchak), on Flickr

As mentioned by others do not judge on a single roll but work with it and experiment, it's a terrific film.