Yeah, as Guy stated, the Phoenix doesn't like losers, it craves power and emotion, and once Namor got the snot kicked out of him, it transferred what it bestowed upon him to the others.
Well this was a Bendis written issue. Characterization was pretty much what you'd expect. Spider-Man was once again used as inappropriate comic fodder during serious situations, this is driving me nuts with Bendis. How he can write him so well in "Spider-Men" and still continue to write a caricature of him in 616 is baffling. They're not even funny jokes for the most part, he just has Peter babbling. The attack on Wakanda was pretty severe. Probably influenced by the Phoenix force, Namor has always been an emotional person and prone to action, the entity probably found him to be one of the easier Utopians to corrupt and influence. I don't have much else to say about this issue. The Spider-Man centric issue is next up...it will be interesting to see how they use Peter in this. The solicits suggest that it is up to Spider-Man now...and have a cover featuring Spidey's torn costume and injured.