I don't think it's that simple and I think I smell a little salt? Lol just poking fun. Anyway I think warlocks are easiest to use. Titans are easy to use aswell but not as unskilled as you make them sound.

Individual gun skills aside, Titans are easiest to play ability-wise. Get close and press a button is their general style: get close, use fist of panic. Get close, drop a bubble somewhere. Get close, use shotgun to proc no back up plans. Get close, use shoulder charge. Their pattern for abilities are very predictable. Hunters are harder to play since they rely more on accuracy and are more rewarded for it. The other classes have a less difficult time since they're equipped with more AOE compared to hunters.