Finally I can get the ranger soul! Which I did already.
All I have to say now that I've tried messing around with every rogue build, there really is only ONE great build, some okay builds, and a bunch of worthless souls.
Best build by far is....
Bard + Ranger. Add any third soul you want for flavor. Marksman or Sab for dps work well.
Why bard + ranger? Well let's see...
As a ranger you get a pet that is damn tough, holds agro, instantly charges into battle, and deals nice dps. You get an instant cast health over time ability for your pet, and a few decent buffs and passive talents.
As a bard you get... buffs and heals. With buffs you can make that simple pet about as strong as any warrior with almost comparable DPS. With bard healing, you can keep that pet and yourself alive indefinitely. The bard and ranger souls also deal out nice dps on their own. You get a ton of abilities that attack your target that can not miss, be parried, dodged, or blocked. Which means that no matter how high the monster is that you are fighting, you will always be doing damage and healing at the same time.
Add in Sab for some more non missing DPS with charges and detonate + some nie AOE dps, or marksman for slightly more single target dps than the sab when you don't miss and you have the perfect rogue package. I prefer the sab because of the AoE sticky bomb with the bard speed buff lets you get away from tight spots if you ever get in one.
In all seriousness, it's not much different than a necro + cloramancer + pyromancer combo for mages. Just less squishy and more consistent DPS over all while healing. Less burst healing though, but more buffs.
I've tried all the other combinations of rogue souls out there, and this is by far the best for PVE right now. Great solo and very useful in groups.
Unfortunately, too many of the rogue souls are absolute trash still even in this beta. Riftstalkers, nightblades, blade dancers, and assassins are just so underpowered compared to the other souls, there is no reason to main any of these souls.
As for warrior builds here's some of my personal favs...
Best tank against physical damage is: Paladin/Reaver/Warlord
Best all around tanks are either: Pal/Reaver/Void or War/Reaver/Void
Best melee dps in the game is: Paragon/Champ/Riftblade (maining any of these three is great for dps)
You really can not go wrong with any of those builds for warrior there. It's silly how strong warriors in this game are.
I haven't messed with mages too much, but they are pretty powerful with most of their souls. Some of the mage souls overlap a little too much though like getting elementalist, warlock, and necro souls all at once is not really a good idea. Most mages pick pyro for dps, clora for healing/support, and one of the other souls for flavor (most of the rest have pets of some sort). The order picked isn't that big of a deal. You can go full support and be one of the best healers in the game as a cloramancer, or go full pyro and be one of the best dpsers in the game, or go full pet class to make solo PVE easier while still being a nice jack of all trades character.
Clerics I haven't touched at all at this point though. But I do know that most of the souls are pretty darn powerful no matter what combination chosen.