Hello. After playing each of the three Supporter class for each test build, I have come to conclude the Warlord is the most powerful class of all (imo). Though the Warden does do a lot of DPS, the Warlord has regeneration HP and Stamina abilities. They can solo far better then any Strikers (though it may take a little longer then a Warden or Brigand), the Warlord will not run out of HP or Stamina anytime soon because of their special unique abilities.
They can solo very well, kite extremely well, and at times, go toe to toe with some blue/white two chevron...may have to run away and heal some and regen stamina, but able to return and go toe to toe again to finish up the melee battle.. Like all range class, Strikers and Supporters, they are very efficient at kiting, as long as they have a bow or crossbow. As long as they have ammunition available.
I think I may end up playing the Warlord as my main Supporter. Use to play the Duelist a lot, tried the Sentinel couple of Beta test build, liked it. Almost was going make the Sentinel my main Supporter go to guy. Now, Warlord by far, is the best class. It may be over powered (imo), but for now, will enjoy the extreme usefulness, effectiveness (both solo/kite and group wise).
In a group, the heal over time is really nice, the stamina over time is nice. Although you have to keep it as active as you can every 30 seconds. For a group, its a win win situation. Heal over time for group, stamina over time. And its suppose to even get better as you level up, as you get higher in levels, those HP/Stamina will increase in numeric values. But, a Sentinel is still a great asset to have in a group with a Warlord.