No there is nothing wrong. It looks dim because the picture is much more natural. You may admire a brighter picture setting than most people, which may be common to most people. The brighter screen appears to give the picture more "POP". At the end of the day, the 5080HD is among the best 50" displays. However, if you think the 5084 or 5884 is much better I would consider them as well.
Chris
Chris