I took Lancer to 50, really enjoy it. I was DRG in XI, so I continued that through to XIV. If played as designed, Lancer is a very strategy intense class - requiring you to move around the battle field lining up enemies for the big damage attacks, landing weapon-based enfeebles, etc.

I'm now working on Marauder, which is the complete opposite of Lancer as far as strategy goes, but it's still enjoyable. Standing in the middle of the chaos, cleaving through enemies left and right.