Y'know, it really bugs me when I'm bad at a game I actually like. I haven't been able to bring down even one of the mechanical bosses since 1.2.1 dropped, and then seeing tahat about half the people on this thread can casually wipe Plantera, who I've never beaten at all, it really makes me wonder why I even play. Not fishing for advice, not trying to rain on anyone's parade, I just wish I wasn't so bad at this.
the mechanical bosses are very deadly at the start of hardmode, but with a good strategy you can do it without loosing much health. i lost several times before i got the right items for the job, same happened with plantera, its just finding which works for you and try to hone your skills in dodging, get the right items and that stuff.
after the first time you kill them it becomes easy (ok, not really, sometimes you get killed when underestimating the enemy) because you already know their moves and what they do once they reach certain lvls of the fight.
in other news:
decided to test my tiki armor against the pumkin moon event. got as far as wave 11. the pumpkings and the mourning wood dish a lot of damage i couldnt dodge all of that, not even with the ufo mount.
got 2 of each trophy, the horseman's blade, 3 spooky hooks, 2 candy corn rifles, cursed sapling and several units of spooky wood.
after getting my ass kicked a solar eclipse happened. it was complicated to survive with the reduced armor but the cosmic car allowed me to stay out of trouble most of the time.
got 2 broken hero swords, 2 deadly sphere staffs, another butcher's chainsaw, another toxic flask and several banners.
outside form the NPCs located at good distance, the town was a complete massacre. just recovering right now.