Google Search updated to version 2.5 on iOS. (Both for iPhone and iPad). I have tried using and it works way better than Siri :-). I know it's hard to say but you have to accept certain things.
What's New in Version 2.5
✓ Simply say what you want and get results without typing.
✓ Faster and significantly improved voice recognition with text streamed on the fly.
✓ Get answers spoken directly back to you with web results tailored to your questions.
✓ Want to see types of questions that work well?
Visit http://google.com/support/mobile/?p=gsa_voice
The new home screen didn't change much though. However the Voice feature has updated so much. Now you can ask Google Search Voice for things like below:
✓ Simply say what you want and get results without typing.
✓ Faster and significantly improved voice recognition with text streamed on the fly.
✓ Get answers spoken directly back to you with web results tailored to your questions.
✓ Want to see types of questions that work well?
Visit http://google.com/support/mobile/?p=gsa_voice