The first hit of Ike's jab as poor range compared to our moves. The second hit comes out on frame 18 iirc. Meaning if we space at ftilt or dtilt at tip range, we can easily hit him before the third hit of the jab comes out. Even if it does, you can simply shield and punish. You can get a shield up for the third hit of the jab if you press shield when you see the first jab, Im obviously taking into account human reflexes. Ike's jab shouldnt be a problem for Marth, if he spaces correctly. If your getting destroyed by his jab, watch what your doing and youll notice that your spacing is failing. A good Marth will stay at tip range this game and wait for openings and just strike then. The best use of Ike's jab on Marth, imo, is to punish lag when you cant use a fsmash, rofl.