'Only having burst mobility' is fine, since she can sit outside that range and chip damage you. This chip damage is scary because you are still in the burst mobility range, so you have to do something about it. If you do something about it wrong, or the bayonetta calls your choice, you eat a divekick and 50%+ damage. The character could totally exist with a regular palutena style counter and I wouldn't be phased, but you add WT and its like... woah. But, having a good option like that means you are more likely to bait it, while this isn't a real weakness it will definitely cost people sets, at least more than you will be baiting a marth or pally to counter.
Speaking of which, why do all these counters have a dodge component, or at least an air stall? You are fking countering, stop dodging too, it just gets you killed! I could land wayy more counters if I could dip down into moves, I can't count the times I counter and the stall makes me 'dodge' then eat ****. For WT its a fair balance component since it doesn't have bad cooldown like most counters, and Bat Within further boosts it.
We will see. It makes me sad that the DLC characters for the most part have more depth built in, in the form of more moves/modifiers for their moves. But at least we got a good amount of them, I'd be way more salty if they dropped Ryu and then quit.