As someone who has had a bit to do with lighting an arena I can tell you that I am pretty certain that it is not darker in the parquet and balcony than it was before. It is likely marginally brighter. What has changed is that it is very much brighter and more evenly lit on the floor. This is good for HD and (someday) higher resolution television. This means that when the cameras balance for the light level on the floor the rest of the arena appears darker.
Generally, I think you are right. The floor is much brighter and the rest seems darker on TV. Probably lots of good reasons from a video perspective to do it. However, I think that the brightness has taken away from the rich gold tones under the old lights. Like others have said, it makes it look like any other floor (except for the crazy ones like TCU, Oregon, etc.). And on the few times I've sat near the floor, I've needed a visor because it was painfully bright.
But what about those who are in the balcony and think it is darker? Is that just their eyes adjusting the contrast so that the brighter floor makes them think the balcony is darker?