I don't find it lame for one reason:
It came off as genuine. It wasn't like those scenes where he's fawning over Robin and Nami, bringing them drinks live a slave. "HAAAAAAAAIIIIIIII, ROBIN-CHWAAAAAAAAAAAAAAAAAAAAN~ *heart eyes*" It wasn't like the previous panels this very chapter where he was all goofy-faced over Pudding's looks in the wedding dress.
It was treated as a serious moment, where he removed her veil, saw an unexpected, previously unknown physical feature of Pudding's, and was legitimately, seriously captivated by it, without a moment's hesitation or shock or surprise. It wasn't played off as sanji gushing over a woman, he was captivated by the eye and felt a bit flustered and embarrassed over it, even. Legitimately.