As other people have said... what do you expect?
I mean, I understand the feeling. We love our Planetside, and don't want it to be fucked with. On the other hand, Planetside 1 only had Battlefield 1942 to compete with... and while similar in some aspects... they were very different in others. Plus, the market wasn't yet saturated with CoD and clones.
Skip to today and finding a large, dedicated audience in the FPS genre is harder than ever. Everyone is already balls deep into BF, CoD, or other shooters. For Planetside 2 to be successful, they can't rely on the relatively small number of folks who have been waiting patiently for this game to release, while giving the middle finger to the other big franchises. SOE has to compromise, and they can do so without fucking up what makes Planetside special.
The classes and killcam are just meant to help bring the BF/CoD people into the fold... without freaking them out....
Once they are comfortable, they will see what a genius play style that Planetside can provide. Lovers of true teamwork with stay and prosper.
I feel pretty confident in this game's future.