i have finally got a bit of time to sit and think.
highly aggressive lists are a little bit of a worry, because you can have a rubbish set of flips and loose someone. but seeing as there are a couple of different 'parts' to the list it will hurt but not shut it down, unless you can do it activation 1 turn 1. that being said i have not played against the top 'aggressive' players yet.
i find the 2 biggest issues for this list is timing out, and misplaying. at the masters this weekend i lost 2 key games by running out of time, both against gremlins, which looked like a win had the game gone to turns, and i lost the other by leaving izamu in the wrong place, to get vendetta'd when i took assassinate.
if you can take the fight to this list it struggles as it wants to get a few things up the board to be able to do the damage but also be a jump off point.
the other thing is that if you get a set of bad draws then nothing can help, no summoning and no hitting.
i hope this helps at all, if you have other questions i will try and answer them.