thats quite common Krish, Look at Paul Van Dyk and Sander Kleinenberg - both produce some absolute cheese, but when they play - their sets are nothing close to what they produce for the radio. Sander for example plays great underground deep prog house sets - his set @ the last Future was fkn mint! blew me away
Although, I'd stay well away from a David Guetta live set - no excuse really, i've just never liked his stuff full stop.
If you're sick of commercial crap, you should be checkin' out the big underground name acts - Derrick Carter, M.A.N.D.Y, DJ T, Sasha, John Digweed - www.johndigweed.com <-- has a weekly recording of his radio show "transitions" - and if you can, see if you can download any of his Transitions mix CD's - all excellent imo; Richie Hawtin, Mark Farina, Metro Area, Dave Seaman, Sven Vath, Nick Warren, 20:20 soundsystem, Booka Shade... theres HEEEEEEAPS! And you gotta remember, with underground stuff - it needs to be played LOUD, and on a big sound rig - the shitter the sound system, the less interest to your ears!