Not that strange. I love Pantera, but don't profess to know all or most of their songs as well. Far Beyond Driven was hit or miss to me. Loved Strength Beyond Strength, Broken, Becoming, 5 minutes alone and shedding skin, but beyond that? Detested Good friends and a bottle of pills, hard lines and sunken cheeks and didn't know what to make of 25 years, although I thought that's a pretty good song. Great Southern Trendkill is the same. Know perhaps 30% of that album, like the title track, Floods, Suicide note #2, but the rest?
Don't even ask me about Reinventing the Steel.
The cool part of this band is that they knew how to surprise you. Deep cuts on Cowboys and Vulgar like The Sleep, Primal concrete sledge, Psycho holiday, Hollow, F#$$%%% hostile, surprised the shit out of me. Tracks like No good or Rise? What the hell? So don't feel bad about not knowing all their songs. There's even more to explore for ya!