Ok, first of all, its not as hard as many of you think to stay out of Marth's reach, and although its slightly harder than Jiggs, its not that bad. Next, if you airdodge and fake approaches, I have seen Marth's who try to u-smash, not commonly, but its the most punishment you will get so I explicitly warned of it. Also, rollout is pointless against Marth, but not because of counter. Counter can be gone through if you are going at full speed and then can kill Marth, no I am talking about his neutral B.
Okay, so you don't want mind games. Pound has better reach than fair, Jigglypuff can string u-airs over Marth and then avoid his D-air while stringing up uairs (really easy) for an F-smash, essentially killing him. Off-stage, Marth gets killed and has no chance if he is past a certain range.
If Marth tries to wait for you, you can use mindgames or no, but either way, you can still punish him. A good move is using a rising pound, so it avoids the grab and any punishment for it. Also, rollout without hitting as a mindgame (I know) works wonders. Also, it is so easy to edgehug Marth (I second him, I would know), and grabbing Marth really kills his game.