In my opinion, the 800 trumps the Titan, and rivals the Focus S.
The front facing camera is a gimmick, and I don't think anyone here will argue otherwise. Removable battery is somewhat of a moot point, some argue that they like the ability to carry a spare battery and/or replace it themselves, others like how phones that lack the removable battery have a much more solid feel (generally) and smoother design. And the 3.7 inch display could be perfect for some users, or horrible for others, it really comes down to preference, I happen to think that it is a perfect screen size.
Also, we have to look at what the general first-time-smartphone-buyer public is going to look at. They don't understand what all the specs mean, what they notice, is the build, and the 800 SOARS in that category. It is an incredibly attractive phone, and it is what WP7 needs to draw in new users, and get everyone to take notice of the platform.