How to play against these classes, what are their weaknesses if any, what to look for, when should i play offensively and when should i play defensive?

I can almost always beat DK but if a good one comes around he ends up murdering me, i pretty much spend my time recovering my health and running and spamming clone from one end to another. I hardly if ever get to play offensively especially if he combo's nicely into a dawnbreaker. Don't get me wrong i combo into an ult but it just isn't enough to kill them, they recover so quickly and are to beefy to 1 combo so im left repeating above, running until i recover health which is often 90% of my time and 10% playing offensively, not because im scared but because I'm never given the opportunity to recover past 30% health from the poison and the burst.

Templars are my toughest match. At this point i just don't believe they have a counter unless you're a tank. Ive seen my friend fight templars easy but alll he does is block... and hes a DK's so templars aren't really that tough to him. I'm nightblade and my scenario usually goes something like this. Templar uses his yellow beam that appears above my character, dashes to me, knocks me down, bursts me down. All this is happening in less than 5 seconds. Once again i don' t have opportunity recover but in this case its much much worse. Even when i do manage some how to survive his first few jabs, i get up, try and recover, by the time im recovered, he rinses and repeats the combo, now im back to square one if not dead yet but more often than not by the 2nd time he attacks im dead. No time to recover, the few times ive landed my ulty they just get up like nothing and burst me down. Ive tried cloaking to play more defensively but i find its even worse then just staying and fighting because of his aoe's and his yellow beam thing that apears above my head, it takes me out of cloak. Are templars just OP because at this point i really believe they are.

I dont have anywhere near as much trouble against other classes in fact 99% of the time im killing every other class with ease unless it's some ridiculously good player which often lasts a solid 3-5 mins of just dodging and ulting and healing over and over until one of us gets a good crit//burst combo down. Those are fun fights because they seem somewhat balanced and it comes down to skill, at least thats what it seems like to me. Templars and DK's are just manhandling me as if im wearing my bare skin with a wooden sword and plastic toy bow.

For those of you guys who are curious, im using --

5 Venomous Smite,
5 Eternal Vigor,
Balorgh's Monster Set,
Poison potion on my 2H Maul.

Runnning your typical skill line --

Surprise Attack,
Executioner,
Rally,
Relenteless Focus,
Camoflouged Hunter

Backbar --

Poison Injection,
Clone,
Shadowy Disguise,
Leeching Strikes,
Resolving Vigor

I'm currently vamp.

I only play NoCP BTW. If there are any great or even good informative videos/clips that are relevant to my questions please don't hesitate to link or leave a title of the video. Been wanting to ask this forever but haven't had much time on my hands, today is friday and was able to put some time aside to be try and be precise with the parts of the fights im having difficulties countering.