Electronic instruments are good in specific situations. I'm a big fan of Trance and DnB, so I love synthesized sounds. They have more capabilities IMO. Trance and DnB both rely on changing cut off and resonance, which kinda makes up for the lack of dynamics.
Electronic instruments can't do everything that acoustic instruments can do (That's why no synth is gonna get between me and my classical guitar :( ).
To me electronic instruments are just more possibilites.
(Woo! First post :P .)