Dark Souls 1 PvE was pretty cool. The boss designs and most of their music are amazing (Ornstein and Smough, Iron Golem, Seath the Scaleless, Gwyn The Lord of Cinder). Some areas were pretty memorable too such as Anor Londo, Lost Izalith, and of course, Blighttown. There were some pretty broken builds in DS1 PvP (the infamous giantdad, darkmoon blade + falchion) but I enjoyed it nonetheless. Dark Souls 2 PvE was okay I guess. The only bosses I really remember are mainly the ones in the DLC (Fume Knight, Sir Alonne, Burnt Ivory King). I didn't really like the level designs in this game because they don't seem connected. For example, you're in a poisonous mining area and when you pass the boss you go up an elevator and you're suddenly at a lava castle. It's PvP is kinda good. The only thing that really annoys me is the lag stabs honestly. There are many weapons and armies to choose from to make a build of your own, the Fashion Souls is strong in this one.