Solid weapon for a blindfold playthrough. On a run where you have about as little precision as possible, being able to poke for huge damage behind a shield is really nice.
It having Strike and Thrust damage type allow you to exploit any ennemies weakness in the game, its very strong, very funny thay made it available so early in Softs.
The damage cost of poison infusion isn't worth it imo, you lose out on massive counters which is the one thing lances excel at. If you want poison, just offhand a quick infused weapon to slash mfs who rush you. Poison Heide knight sword, Poison Manslayer and Mytha's bent blade do the job better.
