Alpha doesn't "suck", she just *ahem* struggles a little. When she's on offense, she devastates her opponents brutally. The kind of "party time" that Alpha experiences when she gets knocked down is a special kind of party time where someone like Momiji & Christie can give no fucks and keep pressing buttons.
Alpha's neutral is okay, but her defensive options are lacking immensely, she is a featherweight, has no wake-up options except for a special wakeup which is highly predictable and unsafe. Also her strings are static as hell and can be held on reaction.