Hello,
As it stands, there is no one-size-fits-all at the moment, so as above suggested by Groot, I would strongly recommend utilizing the Death Droplets to experiment with your character and find what works for you. Like you, as an old player, I was not prepared for the changes (more-so as I spent all my years playing Acid Summoner, which no longer exists), so I tampered with builds for the duration of the droplets before I finally settled on what works for me.
I could copy/paste it, but there is no guarantee it would work for you, as there is room for variation this time around (aspects and rubies - and, for summoner especially, pet choice) -- none of which account for your stat allocations as well, thus you may not be happy with what you copy.
AOP's suggestion of using the 'recommended' rubies (starred) is a good way to start as far as Assault (DPS) builds are concerned. As an Assault Summoner, I'm using zero healing talents (compensated with bloodlust), with the in-built class based heal as an emergency button. This was a personal choice that hasn't stopped me from successfully solo'ing (levelling) or clearing solo distortions when unable to get groups, though that doesn't mean much. Others have opted for full Support builds when solo'ing. Again, just got to take some time out and figure what suits you. Once you have a general idea, I'm sure people will be happy to help you fine-tune it.
Regards,
Mhul
This post has been edited 4 times, last edit by "Mhuldoon" (Apr 20th 2016, 5:06pm)