OK, I gave Paul Rodgers a try after going to
http://www.mercuryparadise.com/ and downloading the performance at the UK Hall Of Fame.
IMO, the guy did an acceptable and decent job as a singer. Of course the first thing that comes to mind are the comparisons with Freddie Mercury, and why we feel like it's so hard (not only for Paul Rodgers) but just about every single great singer on earth to fit Freddie's shoes.
The way Queen fans feel about seeing Brian and Roger with a new singer would be the same as seeing your father dating other women after your mother has been dead for over 10 years (weird analogy, I know). At first it might be hard to accept it, but eventually we might realize that someone perhaps deserves that small shot. Of course no one will ever replace Freddie, and we all know that. But for the sake of those old days that were once and will never be again, it's good to have a small dose of Queen live once again.
The way I see it is that Brian and Roger certainly miss the feeling of seeing people packing football stadiums and cheering them. Imagine not having sex for almost 20 years (another weird analogy), but to me Brian and Roger have a huge craving for connecting themselves to their fans once again, and have thousands of people singing along to their songs at least for once single moment.
Also I feel like another great reason why they're probably going on tour again is because ever since Freddie's death their fanbase has increased to a point where it has either doubled or even tripled. Many of the new fans were not even born when Queen stopped touring or weren't even born when Freddie died. So my guess that they're doing it all for those young kids who feel like the music of the past decade doesn't fit their taste. I mean, just look at all the people on this board. I'd say 2 out of 3 never heard a Queen song on the radio at the time a new album was released.
In the end it doesn't surprise me all the bitching about Paul Rodgers when many of these "fans" say that Queen did mostly shit during the 80s.
Although I think it might be more appropiate to call themselves, Brian May, Roger Taylor, and Paul Rodgers instead of Queen and Paul Rodgers. Of course, the second one catches a lot more attention, but the first one feels like it's right since it's just 50% Queen.