I'll agree that wrought iron lawn furniture can be over used, but there's a reason it's so popular and it's not comfort. Wrought iron works well in gardens with a cottagey feel. The material is rustic and usually in some state of rusting. It suits the surroundings and doesn't look like it will be harmed by a muddy boot or sudden shower.
Use what you like. If you like the look of weathered rust, the practicality of molded resin or retro chic of webbing, in a few years, they'll all be classics.