>>275943814
It might be alright if you're a beginner so guns that come with rails and attachements beneficial because you can't hit shit with iron sights, but most of the guns are outclassed by a single other gun, often much cheaper. It pretty much happens in every category.
If you really have to resort to UMP, you should just get a deagle/revolver instead.
Guns like P90 were nerfed to oblivion, guns like Tec-9 or UMP are useless, even in rifles there's next to no reason to take an AK-12, or hell - even M4 over Aug.
I think tranny config is a futile idea mostly because it can't fix shit like no damage drop-off or retarded recoil patterns.