I think that's around the peak time where most people play, and you'll typically find a good number of cannon fodders on. I usually do really well from around 5:30pm to about 8:30pm typically. After that, I'm about average.
If you're on durring the late late night, you run into lots of people that are really good.
I've been sniping lately, and man it is fun. Someone stated earlier that most snipers are really crappy...I'm about average and that statement is so true. Sniping requires a lot of patience and carefull selection of your shots. Also, you have to be moving around a bit. Example, if you're sniper battling and miss your shot against another sniper...move to a different location to tag him from a different spot. He'll be looking right at the location where you might have missed the first shot. It's awesome getting double kills off of single shots. Especially double headshot owns.