I never got the WD to 60. I believe he's at 40 right now. I'm not going to invest another 4-6 hours to get him to 60 if he's not fun to play now. I found a lot of his skills boring for some reason. With ~200m budget, any class can have sufficient dps to make act3 easy but that doesn't make it fun to play for me.
idk, I think the WD has the most interesting skills. hex, big bad voo doo, fetishes. Passives like gruesome feast, and grave injustice. I barely spent anything on my WD as well, and he can pwn. Act 3 with out much of an investement at all. In fact, building a good WD is pretty cheap overall b/c ias and crit aren't as important to the WD as other classes. Crit is very good to have, but pickup radius is more important for someone using gruesome feast which stacks int for you and refills your mana as you pick up globes. Which is why "thing of the deep" is pretty valuable to WD. It comes with 20 yd. pick up radius.
Just my opinion, and sharing my exp. playing WD.
I actually found the Barb to be extremely boring and repetive at around 40, but I like my Barb to now. Running around with tornados is lots of fun, but face rolling elites with the WD is even better.