I would note not technical, graphics, music. The game is simply impeccable. By cons, load times are particularly long (special mention to the tower).
Very effective in its mechanisms, enjoy good adventure for twenty hours is thereafter ie after exceeding level 25 or 26, you start to get bored farm. The content appears stingy, because it is "farmer" always the same mission to recover the material that you must improve to increase your level.
Except that to increase beyond the level of 20, keep the equipment and improve it. So if you plan to receive rewards galore, you misunderstand. The material is rare, very expensive, requires spending hours every day to do and again ten times the same missions to retrieve the necessary items. At first it can go, but after it's like having a second job. 0 fun. And the worst part is that there will be additional content (paid) until December. Time seems to stretch to infinity and the big heavy artillery arrived (COD and others).
If you like MMOs and games with an important content, go your way and prefer GTA 5 for example happens shortly.