MJS, the Phils accept the good and the bad in Alvarado. The good is he reaches triple digits and everybody who faces him knows he's wild enough to break a couple of your ribs at any moment - accidentally, of course - and he's effective because of it. Can be dominant. The bad is he's also wild enough to walk guys back to back to back and worse.
Regarding his awkward form, if you fix that, maybe you don't have the same player.
As a closer, he will keep the fans on the edge of their seats until the final out.