UMP eats people alive in CQC, if you land your shots that is. If you don't, and you get into a firefight with someone shooting 100 more rounds per minute than you, or more... you're toast. Still though, the UMP hits like a truck, situational. The MP7 is also a hip firing monster from what little time I've spent with it(going to spend more time with it soon). I don't use PDWs all that often, usually assault or carbines here but from the tiny bit I used it, I did NOT like the PP-2000 what so ever.
"Don't excuse yourself from life today, on the pretense of your past."
PP-19 is bad but I still like it somehow. UMP pre-patch definitely even though I liked it very much in the beginning
PP-19 is good, if you know what you're doing. There isn't really a worst PDW, they all have bad and good points, there is no stand out worst in that section imo.
A Song of Ice and Fire, possibly the greatest series I have ever read, highly recommend it. Valar Morghulis....Valar Dohaeris
Dunno what the worst is, but the best is definitely the AS VAL :D
900 RPM silenced deathmachine.