The LG LN5400 LED TV has a good viewing angle and low input lag. However, its contrast is very low and it suffers from some noticeable motion blur. This TV is more suitable for a bright room due to its poor blacks.
The LN5400 does not perform well in a dark room. The blacks are gray due to the poor contrast. If you want an LED TV for a dark room, you will be better served by a Samsung like the F5500.