Yay ajax-y rewrite goodness!
If I find myself using /web/mail that's usually because my normal mail environment* isn't available and often enough that also means shitty network connections, slow machines, and so on. Then a "rewrite with ajax" means just that more slowness torture in the name of "features" I neither need nor want. "AJAX" seems like such a nice buzzword for developers, but to have to use the results easily degrades into sheer torture.
Thus, this is not a reason for me to now flock to opera's mail thingy.
Then again, that's probably not why opera is doing it. More likely it's to "integrate email" with their browser in a buzzword-compliant manner. Now I like opera well enough but I think for email I like my own choice of email client even better.
Thus, that also isn't really a reason for me to now flock to opera's mail thingy.
But hey, maybe enough su^Wother people will. And as monocultures are bad, hmkay, I'm not opposed to opera strengthening their position.
* mutt, if you must know.