Pipeline is cool. Especially for demomen, they can get on high places everywhere and look through the walls. I think it's just that it takes a long time for a round to end. Though in my opinion that just adds opportunities for proper planning and strategies. Except for the last stage. Cranetop on the other hand is... meh (Again, Demomen-campers like me can go all the way up the crane and shoot stickies to the BLU spawn). It's not that bad though, but I think the difficulties for BLU and RED aren't really balanced in the first stages. The last stage is nice, especially the big open space.