I have three 120hz screens and they are sensitive to viewing angles but its much worse in the vertical than horizontal plane so i have them in a panoramic setup, and i have all three angled so they are the same distance and appropriate angle to me and it works great no viewing angle issues. Its somewhat sensitive to how you have everything setup, i use a corner desk and it works perfectly.
I have a dell ips screen on my second pc so can apprecate the benefit and would agree if your not bothering with 3d then ips screens are better however for gaming i really appreciate the extra fps ability, although unless you have very meaty gfx setup its not something thats easy to take advantage of over 3 screens.