Cata is completely useless damage wise (disconsidering acrobatic mount buff). Ppl usually go for cata3 because of trot and the potential cc you can get, it’s damage simply sucks. It’s hard to even find a class with so poor damage considering you invest 3 circles on it (pyromancer 3 is a god of damage if you compare with similar swordies ranks).
I don’t recommend playing lancer on pve, maybe only bossing (some ppl say they can run velcoffer with it tho). I had a +12 Masinios pike, trans 5, 5 lvl 7 red gems and it was horrible to clear a single room from 300 dg, which is easily doable with other classes with similar weapons.
I also don’t recommend playing Lancer on pvp (if you aim to be competitive), unless you can invest a lot. It takes a lot of play skill and godly equips to be relevant in pvp as this class. It hurts so much to give up on my favorite class, but I don’t have either the money or the time to build a super strong Lancer. It’s so much easier and silver friendly to build a psychokino (sage/FF) - super op control, damage and mobility - or maybe a Zealot - “true damage” while on bllind faith and cc imunity if you take plague doc.
Well, you can disconsider my “rant” if you want, some things can be modified when rank 10 hits, who knows. My impression is: if you want to have a better expectation on pvp paying sword, build a Retiarius (or even a Dragoon 3) and let the Lancer for the whales.