Summoner isn't my main class, I play it in PVP all the time because it's really good. Perhaps you're just not playing it right?
It's a head scratcher where people are getting this idea that SMN "has so much utility." One good debuff worth a damn and the ability to revive someone who will just get instantly killed the second they're targetable doesn't qualify as utility in my book.
SMN has:
-No defensive cooldowns to speak of except Eye for an Eye which can't be used on self
Yeah, those damn bards with all their defensive cool downs...oh wait.
-to spend a significant amount of time to get all its dots in place to do full damage, which can easily be removed by purify to remove not only the debilitating effect but also the damage
2 GCDs is significant?
-the weakest basic attacks
It's a DoT class? Ruin II has an added blind as well.
-2 of 3 pets are worthless and which will just get slept/cc'd anyway
Pets are a complete bonus, can set ifrit on the healer at the begininning and forget about it, free healer interrupts. If they're wasting a swiftcast to sleep a pet over a player, I'm pretty happy with that!
-100% spell interruption on damage meaning that unless they are not being targeted (which they should be) they have a hard time casting anything other than Bio, Ruin II or Miasma II (which has a short range and short duration and thus isn't really reliable).
There's also Energy Drain with is pretty damn good and off the GCD for burst damage...also, swiftcast. You shouldn't be having problems with melee interrupting when you can instant heavy them and sprint. It's pretty easy.
-Tridisaster which seems useful on paper but has a longer than normal cast time making it very hard to use without switfcast which needs to be reserved for raise or miasma.
I swiftcast Tridisaster at the very start of a match, usually catch 1 or two people before they LoS.
-Blizzard 2 which is redundant (instead of thunder which would have been useful) due to Tridisaster
You're complaining you don't have time to apply DoTs, but you think thunder would be useful?
Miasma is a powerful spell and the best thing the job has, I can't dispute that, but it doesn't make up for the range of useless abilities and general fragility of the job. I play it in PvP purely because it's been my main since the game came out.