Playstyle: Or how do we do solo as well as in groups?

Solo: I spend a lot of time both solo and grouped. Being on a PvP server its nice to have a group of friends around, but I do find myself going solo alot as I work on crafting, catching up on quests that others have done, etc..etc..I generally don't have any problems taking on multiple mobs. At level 31 I was able to solo the Elite Ymir Frostgiants with about 10-20% health left at the end. Packs of mobs a couple levels lower went down fairly easy as well. I spent a couple hours grinding over the weekend and was able to chain pull lvl 30 Varnir Elite Captains getting 350 xp a kill. I was able to solo the Spider Cave right before the Plains of the Dead when the mobs were 3 levels or so below me as well as kill the Lurker inside.Potions, Food, and Sprint are your friends. All of my armor and weapons are quest rewards or drops so this isn't being twinked out or using the best of the best. I generally swing by the potion and food merchant and buy 20 stamina and 20 health pots and it keeps me self sustaining for a few hours. I give the class a huge thumbs up for solo playability.
Group: Groups are where we really shine. We have a variety of buffs, commands, auras, and procs that make us a very desired and wanted class in groups and instances. We get a mysterious ability called Furious Inspiration that as far as I can tell procs when our group mates get hit. It stacks up to 10 times and when it is fully applied will proc in-combat resses on fallen members, increase the damage of all in our group, and just make us really popular, sorta like the prom king (or queen if your a girl).
We get stances, Normal, Frenzy, and Defensive.

Frenzy: Our offensive stance. Adds 150% damage but we take 300% more. You do not, I repeat, do not want to be in this stance while tanking.

Defensive: Our tanking stance. Lowers incoming damage but slowly drains stamina while in it and decreases out offensive power.

I was originally disappointed with Defensive stance in Beta and considered the only viable stance to be that of Frenzy, but find myself staying in Defensive more and more often, especially solo now. (You were right Renuo I'm eating my words in release) I don't really notice the stamina drain from the stance and my damage input/output in Defensive is worth it atm over the input/output from Frenzy stance right now. Maybe when I take the Frenzy feats it will be more worthwhile but in solo and pvp Defensive is very viable, plus there are defensive feats which may offset the lower dps of being in Defensive Stance.

Soldier Skills:

We get Charge at level 20. Charge is an ability that uses out Stamina but propels us forward to a target and increases the damage of our next attack. Charge is wonky right now I feel. Sometimes I'll get teleported 40 or 50 yards away, or charge through players, get stuck in trees or rocks, or just get a message saying you can't charge your current target. It may be that I grew used to Charge from World of Warcraft, but currently if there is anything in your way, or if there is an elevation change between you and your target you're going to more then likely not charge. Not too sure why you'll get teleported. I've heard tell that it is because you queue an attack before you charge. That may very well be the case, but I've stopped queuing attacks and still get it on occasion.