Hehe howdy
Well, I have the most problem (as in getting pwned, most often) by vamps that got either good parry and evade (+ hot etc) or/and that got high lvl fumble-debuff or/and high claw-spamming or/and got that 45 Dementia spec, thats got a 3.0 seconds castimer, and shear a random buff.
When it comes to "honour" 1vs1's, I usually won't fight a buffshear Vamp, because fighting with half the buffs, or even losing all, make the fights very boring at the recieving end (even if i land a slam, what good does 2-3 melee hits do, or 2-4 nukes?).
If i purge the fumble debuff and my celerity (fsls) proc, then I might stand a chance vs a spamming (high) claw-spec, while using charge so I can't land slam.
Mm, reavers (including all those classes you mentioned) are all nasty solo classes, but somehow (helps that its classic) I beat most reavers (haven't lost to one, since rr5 - IF I had/have all timered abilites up). Kinda fun, because most Thanes eat the dust quite fast vs a reaver (since the instas, etc, nullifie the casting/nuking (less than fun since many Thanes go with a 50sc spec - including me, most of the time).