Short answer: no.
Long answer: There's one guy who mains her at 2200 ELO or so, but he's probably pushing the utmost limits of Poppy's potential and likely could have done even better with a different champ. On the other hand, she does extremely well in Dominion where there's no laning phase to hold her back and her crippling mana problems are partially overcome by healthpacks and global mana regen buff. Even then she's less of a roflstomper and more just a generally strong pick. Strong ranged CC can help shut her down, and there's a few who can out-duel her, but she'll serve most Dominion teams well and she's certainly competitive there. Not so much in Summoner's Rift though.