Aatrox is crazy buggy right now and should be fixed.
I've seen so many bugs with him this patch. To name a few,
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Sometimes you won't be able to use ANY abilities until your passive pops, or until you're CC'd again if CC'd at the right time (this has lost me teamfights many times before)
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If killed (not passive pop'd) during Q ascension, sometimes you won't be able to cast any summoner spells until you Q again
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Q sometimes doesn't get interrupted from displacement CC while ascending (not 100% certain if this is a bug)
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If passive is popped during Q cast animation, it will continue on and knock up anything at the target area even while reviving
Every single one of these can be very game breaking, and the first 2 are really starting to piss me off. They need to be fixed ASAP.