It seems the thread has been reduced to one of personal preference, which is where this topic will always end up. Disciplined engineers consider the limitations of various materials and are required to find the best menage au trois between function, aesthetics, and contribution margin (cost) of the piece. Often, its the things that we think are "cheap" that add more cost to our products. A paradox--the perceptions of plastics/polymers are cheap but they may, in fact, contribute more to the cost than sheet metal. I don't know that for sure, but I'd bet a donut or a domestic beer that a metal hood is less expensive to manufacture than a high-impact-thermo-poly- carbo-nucleo-resin---whatever... plastic hood. Make sure you let me know if I got the science part right....
My $ 0.01 1/2 (adjusted for for current economic conditions) is that the new polymer hoods will have better long-term aesthetics unless left out in the elements or subjected to abuse or industrial conditions. I don't care what material is used, if you leave your equipment in the yard year round, ram it into the brush while working, or drop heavy objects on it it's going to get dented, cracked, broken, faded, or generally look like crap. Having said all that, I also believe a company should stand behind their products for a reasonble amount of time--the good ones do.
I think the original post was about the cost to replace the plastic hood. I wouldn't want to spend nearly $200 bucks to replace my hood either, but if you would have asked me to guess the cost of a NEW replacement hood for a lawn mower, plastic or metal, I would probably have guessed around $200 (that, BTW, my son would be working off for a few months if he was the responsible party). You've got to remember that most companies plan their manufacturing processes to make the same number of hoods as they do chassis and mower decks and headlights and steering wheels, etc. Parts like a hood are either planned overruns that sit for several years (in the dreaded "inventory" status) or special tooling jobs which are just plain expensive. Don't forget freight and other handling costs.
BigPete-Who's-About-to-Become-a-Mowin'-Maniac-for-Six-Months