Is it supposed to be like this? Am I missing something? Summoner DPS is not good.

[Edax]

YES I KNOW THIS ISN'T WoW SO NO NEED TO CLARIFY THAT FOR ME.

So I'm playing my Summoner and at lvl 54 I'm pretty much getting my butt kicked if I try to take more than one bad guy at my lvl. Even one bad guy can beat on me pretty good.
I pretty much have to use my mount for a tank or it gets a little too close for comfort sometimes. Now it could be that this is how it's supposed to be or it could be that I'm doing something wrong. Both are a possibility.

So generally my rotation goes, drop dots, spread dots (if needed), drain energy/energy siphon, fester/painflare, rune and then fester/painflare again.

Generally I think that's how it should go...am I missing something?

My first guess is that you forgot to gear for Heavensward.