Yeah, Porcupoine explained it correctly. I should use the term "FPS" from now on.

But seriously Starhawk and Halo are pretty darn similar. However there are a few factors that take them apart but overall they are similar games. 

Do you know when the online beta releases in Europe?

It already released 5 days ago to people who have Uncharted 3 and the Starhawk beta voucher code. 

I can see the similarities. Both are centered around extremely large, mulit-path maps (both excellent for Capture the Flag games), a variety of weapons (though Starhawk's weapons are more realistic), a variety of both land & air vehicles, and a involve a decent factor of teamwork at play. The factors play huge importance in these games moreso than most games.

I'm pretty sure there are more similarities, but these are just the ones I could think of. Of course, both are offering different styles in many ways, but I can see how a comparison could be relevant. I'd certainly be interested in it. Or at least I wouldn't dismiss the idea.

Of course I see the similarities, too, but the genre alone makes a big difference for me. I'm still thinking a comparison couldn't be fair, but I'm obviously in the minority here, so I won't argue. 

No one will judge you if your minority or not. Just give a good reason and a detailed exlpanation why you think the two are so different from each other and really I'll understand your point of view.