I'm fine with JiP. Better then just being down the whole time in man power. What there should be is a mechanism bonus to REQ that gets implemented either to just the person joining late into a game or to the team that is down for participating till the end.
Last weekend during 2v2 games, I had my wingman drop twice right in the beginning of the match.
First game, I won against 2 players, being as sneaky as I could.
Second game, my K/D took a beating but I lasted to the bitter end.
It would have been great to have someone join up on me to help. Or else it would have been great to be given a bonus to REQ for sticking it out to the end.
Either way, when I join a game in progress, all I know is that I will do my best and the match is usually close to being over and I can get some easy REQ points.