In fact if one listens to their compositions carefully it would be found that they have a special liking for miscellaneous guitar effects.
But I do get surprised by relative lack of Carnatic & Hindustani classical in their music. I agree that their music is entertaining and much better than few others but I expect more.
Because of the fact that Shankar Mahadevan has been a part of Shakti which revolutionised the fusion music. Besides, Shankar is known to have good command over both Hindustani & Carnatic classical. He is also a prolific player of Veena, all the more reason to expect more...!
I maintain that while composing a musician is influenced by three factors:
1. Market pressure: which includes taste of people
2. Composer's own capability: acc. to his training & exposure
3. Film situation's demands.
Two names leap to my memory from Golden era music who were known not to change tunes acc. to demand of film director : Sajjad Hussain & S D Burman. In fact S D Burman was reluctant to change the tune of a song of Aradhana which was based on a Rabiindra Sangeet and was not fitting the situation: Kishoreda salvaged the situation and song which finally came to us was Roop Tera Mastana....!! ( courtsey ms04)
IMHO S-E-L is one bunch of composer which can deliver much more classical tunes ( because of Shankar) than they are doing and then can present it in a more acceptable format ( due to Ehsaan & Loy).
Any taker........??