Ok, I'll bite.
Yes I can tether and I don't pay extra, I was using it one day ago. Free google nav no, free mapquest nav yes (same thing, I've used both). Installing non app store apps is a choice and if you want that you can jailbreak but not everyone wants to install non app store apps, just like android there is a choice but apple makes it more difficult doesn't mean it can't be done. Actually it does but it sucks it's on the back cause it uses the camera flash but not all androids have led notifications. Samsung doesn't and the nexus just got one (previous models did not). As for 4G if you mean real 4G ie LTE there aren't a lot of phones that can do that and since it's new the battery life is terrible. If you think the nexus is 4G you got anther thing coming its max is HSDPA 21 Mbps while the 4s is 14 Mbps, in real life you won't notice I bet (except for Verizon, I think that's LTE but the more popular version will be the gsm model around the world)
Same things just different ways. The way you think is better to do things will ultimately make that phone better for you and you will say it is better but they do the same stuff in different ways.
For the sake of argument and accurate information I'll deposit my two cents. I have to agree with the other guy, they don't do the same things. There is a plethora of things that can be done on the Galaxy Nexus that can't be done on the 4s. I will not make an exhaustive list but I will throw a few things out. But to start off, I will address a couple things that were already mentioned. Mapquest's nav app and google nav aren't on the same footing. Google nav is integrated into the OS which gives a little more functionality in other apps than what you can get from mapquest's app. As for LED notifications, iphone does not have a led notification light, and flashing camera flash is nowhere near the same thing. That being said here's just a quick list of things that can be on the GNex that can't be done on the 4s (this is by no means an exhaustive list, this is just off the top of my head).
1. Transfer files via bluetooth
2. Pay for things using the phone (nfc, and yes I use it almost everyday)
3. Write nfc tags (this is useful to create nfc based events, for example placing my phone in a universal car mount with a nfc sticker will cause it to turn off wifi and go into car mode.
4. Connect phone to television and play video games using playstation controller. The phone is the console and it's all output on the TV and you're playing using the playstation controller. BTW this is great when using onlive and really comes in handy in hotels and you need to pass the time or have kids with you.
5. Social network integration other than twitter. Some of us don't like twitter and would much rather use facebook for example. I can have OS wide integration of any social networking platform.
6. Ability to control what apps can use data, and control how much data my phone uses.
7. Though the led was mentioned I'm going to mention, the fact that I can use rgb led alerts. Meaning I can make the led whatever color I want to for whichever alert I want to.
8. Specific alert types for specific things.
9. USB host. I can connect various usb devices to my phone using an adapter.
10. Ability to not use any storage space on the device yet have every song, movie, and photo available to me as if it were stored locally.
11. Interapp integration. Certain things from one app will be available in other apps and throughout the OS. For example, evernote, dropbox, and many others.
This is by no means an exhaustive list. These are just some things off the top of my head.
