TDM is kind of easy to use snipers in. Objective modes is a little harder. It all depends on how good you are at controlling the engagements and keeping a good distance that you can pull up you sniper and kill the enemy before he can you.
Sniping is hard in general.
It's not though is it?
I'm average at best with a 1.2 TDM KD, so if something is hard to use then I will not do very well with it at all, Riot Shield, Crossbow, etcetera are hard to use and do well with.
Snipers on the other hand because I actually use them properly I have 3 out of 4 of them in my top 5 kd guns with the XPR 1st and DSR 3rd.
1 hit kill Snipers are NOT hard to use at all if you use them correctly, I'm living proof of that.