they DO have issues though,mainly in articulation,and the way they've been designed/put together...
Thor's arms will not go all the way down...like,this pic:
literally shows you how far the shoulders go down...
the hips are also wonky....the don't go straight up or out,but rather king of swivel around to take other positions...but,again,they only go up so far with this method....
Loki has much better articulation,and much more funstional articulation...this creates the one problem with him,however....he has double-jointed knees...
the problem this creates is a manufacturing one rather than a deign one,as the plastic used is cheap and wobbly and has trouble supporting the upper body weight on the knees unless the legs are positioned just right....
sculpting and paint-wise,they're great....but they still have issues with articulation...and cheaper plastic does not a good toy make...