There will be more downtime between fights than with greens, but you will also get more experience points. A group should have no trouble taking out a single blue, and if played right should even be able to handle a group of them.Don't even bother to attack these. Leave them for lower level players. The game is designed with the idea that you will solo blues. Groups should be able to handle single yellows fairly easily, but might struggle against groups of them. Purple named Mobs are a much higher level that you are.Sometimes this is unavoidable, but you need to consider the consequences of going around and attacking everything that moves. Alizations you are going to get and decide how you want to apply. It is very important that vindictus gold players plan ahead when using your skill points.