I like all the anime adaptations a lot (yes, I even liked the 2006 DEEN adaptation back when I watched it over a decade ago), but I was keen to go back to the source, mainly out of curiosity. Despite the rambliness of the text, I don't regret reading the VN. It helped to explain a few plot points that baffled me (especially the ending of Heaven's Feel movie 3).
I wish we could get official English versions of all the associated light novels like Fate/Zero, and Fate/Strange Fake. I really liked the most recent hour-long OVA and I can't wait for the full anime series.