Kirby's got an evil WoP I can do as well, but with the characters you picked (especially fox) its just much easier and less hassle to do throw combos =P
Oh, I just remembered. With Marth, try to avoid using smashes unless they're going to kill. Marth's smashes come out fast but they all have some ending lag on them making them easy to punish. KOing vertically with a running up smash also tends to work better then off the side with forward smash (unless your facing Dedede or Snake). Up smash has a hit box in front of Marth as well. I think the only grounded foe it will miss against is Kirby or characters with a low duck. His down air only spikes when tipped, so its generally better to F-air or B-air. Try not to wander too far away from the stage, as a prediction that knocks you away (like I did occasionally with my Waddle Dees) can force your poor recovery against you.
My Creations in Modnation Racers! Check zhem!
http://community.modnation.com/en-us/players/IvoYaridovich/creations
