Having not read much of the previous comments (it's a late night here) I did want to thank Verizal for an excellent dev diary. I did read a few initial posts (sorry if I've missed something important since then) and noticed a lot of concern about threat.
But to be honest... I'm having the opposite reaction.
My experience as a tank: I stand in one place and do nothing but spam my threat skills (mostly just to appear like I'm actually doing something, and also just to be doubly-sure that I don't lose aggro). There was no challenge to it. I skipped using most of my damage skills because they didn't do much damage anyway and my guardian is a power-hog (btw, that is one thing left unaddressed: power management!). I yawned my way through so many instances...
That is completely different from any other class I've taken into instances (particularly the minstrel). It just wasn't exciting. It was more of a faceroll. Unlike wardens, who (from what I understand) build threat over time and must actively work to hold that threat, a guardian just has to spam his forced aggro skills. Faceroll against 1 mob. Not much harder against multiple mobs. I just didn't have much fun.
But from what I'm reading in this dev diary, now maybe I can actually do something to contribute more in groups. Even if I still focus solely on tanking, I can dip into the other trees. Maybe get some bleeds from The Keen Blade, maybe some marking abilities from The Fighter of Shadow, all the while providing useful buffs while tanking in The Defender of the Free.
I really like what I have read. I still have major concerns about power management (considering how few skills guardians have to restore power, and how inefficient they seem to be) and captains did come to mind when I read about The Fighter of Shadow, but as to the rest of it I feel pretty excited.
R5 100 GRD Marevayave - Leader of [U][B]Riddermark[/B][/U]ed For Death
R8 100 MNS Fayah/100 LM Siennah/100 HNT Dinenol/100 RK Dhurik
100 CHN Alachas/85 CPT Dinfaerien/60 BUR Dhax/35 WDN Godoric
R9 100 MNS Fayeh (alt Wilya) - Lonely Mountain Band @ [U][B]Landroval[/B][/U]