One strategy is to have the weak partner position over the net post. While that might make you a better team, I don't think your partner would like the suggestion. In a social mixer, I don't think it's ok to say that.
I guess you have to figure that in certain situations, winning is not the most important thing.
I agree with you Steady Eddy, there are some variables of how to play when the pairings are lop-sided. I've been on both sides of the stick. If it's in a competitive match like a tournament, you do whatever you have to do. Hopefully the partners have communicated the strategy before-hand so they are on the same page. If I'm that weaker player, I'll tell my stronger partner that he's the captain and to take any shot he can get to.
If it's a social match, and I'm the stronger player, I let my partner have some "fun" too. I'm not going to hog everything by jumping in front of my partner and stealing his shots. I just witnessed on the court next to me an ugly scene during some mixed. The male, wanting to show everyone how "good" he was, went "singles" on his lovely lady partner. She was a mover too, and in the resulting "chickens with their head's cut off fire-drill", macho man smacked his lovely in the face. Last words were "Does anyone know a good plastic surgeon--on a Sunday?"
On the other end of the stick, I've played socialy with a tournament player who was so egotistical, that from the git'go, he told me to basicly stand in the alley and he would take
everything else. I'm his equal in singles and better then him in doubles. I said to him, "Would you prefer it if I just sat down on the bench?" We played the match and I more than held-up my side of the court. I could tell he was irked that I stood up for myself and I lost respect for him. He should stick with his singles.
Playing socially it may be fair if, all are agreeable, to share the wealth and round-robin with the weaker player. I also think it's nice to convey to the losing partner, who carried the anchor, that you recognized he got the short-end of the stick, (whispered out of ear-shot of the weaker player of course, so as not to hurt their feelings).