He is right about PVP. 2h is king but you have the option to deal damage from range with the bow or get into the thick of it and use S&B.

PVE is dual wield and bow. The bow ability endless hail does more damage than any other (stam) ability in the game and you can't leave home without it. Dual wielding gives you two different traits (importantly crit chance from daggers) two different enchantments, more weapon damage and blade cloak for AoE resistance. Which makes 2h much worse in PVE.

Stamwardens are really strong in PVP and okay at PvE.

If you solo a lot, any class is fine. Warden is really fun to play pve solo questing. So don’t feel bad about that. And you can also enjoy normal and vet dungeons and normal trials no problem.

In terms of veteren group content though, Stam wardens arent as competitive as others. Mainly due to class skills that complicate a rotation. In terms of endgame power, the ranking for stam players is like this:

Stamblade>stamdk>stamsorc/stamplar>stamden.

Of course skill comes into play, and most groups may want a stamplar with them, but that is the general hierarchy.

But, if you are just starting out and need to build up cp, play the warden. And to be honest the stam warden is really powerful in pvp, which is really all that matters, am I right? Things may change by the time you are ready for endgame group pve content.