Yes, they have uses. I have gotten to use Lich form with 0 pressure and just decimated. But generally you become a big target (literally) and can actually be brought down pretty quickly. Ever been Moa’d in Lich? That is a personal favorite of mine.
Plague form is my favorite and the one I think is in need of little to no change. It can have quite an effect on a team fight. That said, it is a skill that puts you right in the middle of the action… in many cases you are nearer to the thieves, warriors, etc. than are your own thieves, warriors, etc. In any case, it is a fun as hell skill and the one I use almost exclusively.
Flesh golem, on the other hand? It is crap. Sure, it has a place. It has a nice skill that comes along with it. It also has that really interesting passive of ‘standing right next to you doing nothing while you get beat on’. Have you tried using that awesome skill when there is a hill the size of a pebble in the way? He slams right into it and starts up the cooldown.
Remember, I said underwhelming elites… not useless elites.
As for DS… yes, you can trait to get more time (.5 seconds actually). Yes you can trait to get some damage ( < 400 if my tests were accurate). In both cases it DS skill #3 marginally useful. I think the reason I dislike it so much is that the extra second I buy using the skill doesn’t really allow me to do much in the way of adding on damage (given the cast time on skill #1), so it is instead part of the problem others have already mentioned. Namely, Deathshroud feels like the place Necros go right before they die. That fear feels like my last ditch effort to do… something.
Yes, some cheese builds are as you mentioned. I’ve messed around with PW Thieves, and no doubt 100b Warriors are the same. There are legitimate burst builds that are viable long term, Backstab Thieves come to mind as do Rangers.
I also don’t think I am worthless. I think I am underwhelming. I often rely on my opponent just being dumber than me (which works surprisingly well), not knowing my class, or not targeting me. If left in the back, I can get my stacks up. I can spread them around. I feel pretty good about it. That is the most ideal of ideal situations, and I still feel a little underwhelming.
And I agree about guardians. They are the class we counter hard (assuming of course that this is a conditionmancer build… and who are we kidding. {I roll axes quite a bit, but I like to brood so it works}). They don’t get their nice heals off due to scepter poison. Our bleeds ruin them since they are a toughness class not a vitality class, and what you mentioned.
Also, in tPvP the situation might be better. The 5v5 format of it changes a lot of things. I can’t speak with any authority on it, so I won’t. Necro could be the most broken class there for all I know. I speak about sPvP (I think we do fairly well in WvWvW too) as a casually competitive player, only.
Remember:
Necro != Useless
Necro = Underwhelming