@ VindicatoR, are you playing a Barb? I have read around a lot that you should stack heaps of +vitality gear for more survivability.
I unfortunately didn't get a lot of playtime in this weekend. Am currently level 27 on my Wizard and still loving it. The wizard is incredibly powerful when played correctly. Diamond armor makes me tank like a boss, frost nova is still an incredible CC, meteor makes dealing with packs GG. My current build:
http://eu.battle.net/d3/en/calculator/wizard#UcXSYk!bc!aaaaZ (elective mode FTW). I want to use more skills though... Slow Time is just pimp! For coop though, my build will change dramatically I rate.
I have really been taking my time though and am enjoying the game properly, but I am getting tired of declining invites and not playing MP. I just want to get my "solo" playthrough done now. Most of my friendslist are starting or progressing through nightmare / hell / inferno and I am missing out on a big portion of the game. Can't wait.
That being said, I did make a decision to play 100% solo through normal and will stick to it