Are you using the beta currently? If you are, are you still being rerouted to searching terms via Safari?
I was referring to the released version of Siri, but I'd like it if Siri in iOS 11 were better. However, it would take a lot of improvement to make me happy. My car doesn't support CarPlay, so my use of Siri while I'm driving depends on it being able to respond to questions like "How is the traffic up ahead?" verbally.