Ugh. That explains a lot to me too.
FYI, Hi-Rez are doing it deliberately. When one weapon in theory costs £7 or an entire month of dedicated grinding to unlock (less with the 'bundles, but of course you end up spending more), of course it's going to be better than the existing stuff.
Invisible players + one hit kill explosives (Jackal) - absurd, as a base defender you cannot defend yourself against it. I resorted to being a Technician and staying within sight of my turrets, so either I died and my turrets got the Infiltrator, the turrets died and I got the Infiltrator, or they got the objective they wanted in the first place.
Now we have the plasma rape gun which is absolutely tearing up Arena.
Note how the classes with bundles also have to be unlocked first, which puts them out of the price range of a normal gold pack buy if you didn't do it with XP.