Online Frustration

So today was the first time I've played online with people I don't know (I am a level 51 mech.) since I normally just play solo or with my room mate and after getting booted 3 times I've never been more frustrated. I understand the first one, my DT blew up a barrel right next to a guy, but the other two times I got booted right as Capt. Flynt had just a sliver of health left for no good reason. Do I just not realize that I'm playing like a d bag or simply getting unlucky with the matchmaking?