Well, they only thought about integrating most features that already existed for ages into iOS after Android started to bite their heels. That's my point. For 2 years now Android isn't trying to catch up to iOS on nothing, although iOS with tethering optios, notification bars (for example) has. My next bet is a new keyboard - it was good when it came out, but from 2.3 on the android keyboard is miles ahead, not to mention the best keyboard ever - swiftkey.
I was the first to state that with 8 hours Iris could mimic Siri (or a big part of siri) and it fooled most people. For a siri like performance you would then have to have a dedicated server for natural language processing and interpretation... Something that will come, some day, when google wants to. But that's the "only" real extra feature Siri has. And my hat off for Apple for seeing that it was needed (for the most part google only thought about understanding what you spoke really well and discarded the rest).
And voice controls is something any Android device can download for free from the market (same as most google apps, actually). It's a feature, but it isn't forced on you (neither is maps, navigation or google docs), and if you want you can simply use any other Voice Control app out there that doesn't rely on that ( I use https://market.android.com/details?id=com.cyberon.cvsd because there is no language barrier).
Lastly, Android's multitasking is miles ahead of most mobile platforms (again, if you're using a nice phone). Just staring at the logcat and seeing all the stuff going on in the background will give you and idea of why it is awesome.