He has to walk up to you still, it doesn't take less than one second to finish, Cho's burst combo takes just as long, most assassins and burst mages can burst you down in that time.
Let's be honest, Talon isn't strong either. If you are squishy, you SHOULD be dying to burst. That's the point. If you don't die to burst quickly, then the burst damage isn't burst. You shouldn't be able to do much to prevent burst, except for building resistances(armor/MR, HP,Banshee's passive etc.) "Burst" is supposed to have you die before you can respond, and then be significantly weaker after the burst.