
Pictured: Waveforms of the following songs, in order:
The Crystal Method-Weapons Of Mass Distortion
Faithless - Insomnia
David Guetta - Just A Little More Love
Eminem-Almost Famous
Offspring-Have You Ever
Exploding Plastix - Kissed By A Kisser
Bartekko, Nirvana, Deadmau5, LMFAO - Slip Like Teen Anthem
LMFAO - Party Rock Anthem
Many songs here (especially the david guetta ones) are "brickwalled", which means that the mastering engineer used so much compression/limiting that the song is basically a one big brick. there is zero dynamic range, and the song is loud as hell. It is acceptable in dance music, but when there is so much limiting, the song starts to get distorted in the ugliest possible way: digital clipping.
To understand, acquire Insomnia by Faithless (monster mix preferably), put a limiter with high gain on the master track, and listen to it, comparing to the unlimited version. You should be clearly able to hear the difference, not only in volume, but also notice a lot of distortion.
And you do not want that.
So stop comparing your music to commercial stuff, and just make it sound good. Only thing you should need, is a little teeny bit of limiting, so your track doesn't clip