metal can mean a whole world of different things.
my suit it almost all metal at this point. helmet, chest, back, shoulders, cod, kidney. it's thick stuff... 1/8" - 1/4". everything but the back is aluminum. the back is steel.
it looks great, it's durable, and it's perfect for layered weathering.
it's also heavy, conducts cold and heat way more than other materials (so you feel colder in the cold and hotter in the hot!), and it's heavy.
there are folks that make thinner stuff, out of sheet metal. i have no personal experience there, so i can't really comment on it.
so it really depends on what you're going for.