Necromancer/Reaper
You are too late for the balance patch — at least two or three weeks too late. These are not done overnight, they are done well ahead, tested thoroughly, bugs fixed, and then finally released to the public when anet are confident in them.
(note: having a million people hit them can turn up bugs that all the internal testing in the world didn’t, which is why sometimes they get revised quickly. before someone objects on those grounds.)
Anyway, beyond that, this isn’t a bug. It’s certainly something that many players feel to be true, but: to convince the developers you will need to, at minimum, show that this is caused by something more than simple player prejudice.
Probably the best strategy for that, now, would be to collect raid logs from DPS meters, and aggregate them at large enough scale to get a good overview of performance. Then show that GS reaper is unable to perform adequately compared to other classes in the real world.
Sadly, I don’t actually think you will have much success there, though: the anet developers have access to this sort of information internally, and no doubt spend a great deal of time looking at both player perception, and the reality of performance, and use both to inform the balance patches.
Since we should assume they are not incompetent, that means that the corollary to “this is not buffed in balance” is “because performance in the real world is comparable to other classes and specs”.
(if you do assume they are incompetent, I’d strongly suggest finding another game: staying will just lead to more frustration on your part, and we play games for fun, so … that’s a sign it’s time to move on.)