Mantot - One "tot" (Chatot) this generation is enough for me.
Inmant - Is this supposed to signify "infant"? For some reason it makes me think of a preying mantis... I think outright saying "tyke" is better for the comprehension factor.
Manroe - Roe? Manroe? Sounds oddly like a name (Munroe, maybe?), and Hitmonchan/lee are about the only ones I can accept. Plus, what's the Roe mean?
Mantiny - This is just aesthetic, but Mantyke appeals to my ear slightly more than Mantiny. Two syllables vs. three, you know? Has a crisper feel.
Mintine - I don't like mints. ^_^
Fantine - See, I don't drink Fanta. I usually just go for generic sodas.
In short, while I don't like the name, I think it has more to do with me not liking the Pokemon. Again, Mantyke sounds better to me than any idea I've had or heard - even though I can't say I particularly like it.
Relevant meaning + Decent aesthetics + I have no better ideas = A lack of complaints.