As to the 4v2's it's probably the luck settings. At 75% luck, you still have a chance of failing that 4v2. At 16% (where strategic 1v1 template settings are used) a 4v2 is guaranteed.
On the booting thing. This has been a long discussed issue and there is a UserVoice item for it. If you want to change how it works now, vote for this option.
[http://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1240763-teammate-takes-over-for-booted-surrendered-player?ref=title](
http://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1240763-teammate-takes-over-for-booted-surrendered-player?ref=title)
I do agree that it stinks that the game is basically done when a your teammate gets booted, but I think one of the main reasons that this hasn't been highly voted on is because it can be easily abused. It would be easy for someone to plan a boot to gain a competitive advantage and I believe Fizzer doesn't want the situation where booting is a viable strategy because then the game would be drastically changed.