That's what I dislike about Mixed. When I play a net shot as a short serve return and move back the female opponent is standing at the net waiting for the reply. Playing right into her hands, because she's there early and my partner has to move in. On the other hand if I stay, I will kill every bad net shot or push it to the midcourt. I think this is the proper way to play if you have a capable Mixed lady at your side. Of course it's better to rush to the back if your partner cannot put pressure from the back at all.
This may be your experience, but it doesn't stack up to me. And classifying this as a problem of "mixed" seems a bit harsh - there are plenty of mens doubles players I can't trust at the back because their attack is hopeless. Similarly there are plenty of ladies that can easily control the back of the court.
If I'd played a net shot return in mixed:
1. I didn't play it to the waiting lady. She will have to move to get the shuttle and she won't be taking it early unless I played a pathetic shot. This isn't about the lady being there already, its a shot choice OR a shot quality problem. You make it sound like she knows what shot I will play and is in prime position to kill it. She doesn't. She doesn't know if I will block, push, drive, straight, cross court or middle.
2. My partner is already well placed near the net, and is moving in as I play the shot, knowing that I am going to hit a shot and then move out... so i wouldn't expect her to be late to any net reply from the other lady. She will have as much time as the waiting lady to see what I do and cover the court appropriately. And that's not even taking into account that my choice of shot will make it harder or easier for my lady to cover the shot: if I play cross court to the side my lady is on, she won't have to move far. If I play to the middle of the net she will be in prime position to kill any net shot, if I play it straight to my side I may be making it more difficult for her. There are lots of options, but the key is your partner must be on the way forwards before you've finished playing your shot.
So if the the opposing female was indeed standing at the net waiting for the reply, I would push it slightly past her into the midcourt.
If the opposing male is able to take that push very early, then I can simply play a fast drive to the back corner instead with a slight hold and hit, particularly if I turn the racket and hit a cross court drive. This works in my estimation because:
- No female can cover the front court and the midcourt in both tramlines in a devastating attacking fashion
- No male can cover the midcourt and the rear court in both tramlines in a devastating attacking fashion
These are particularly true when the opponent doesn't know what shot you are going to hit, due to good variety of shot making and technique. I have never seen a match in which there wasn't a safe shot to play, although it depends on your shot quality and movement to be able to execute the shot.
So to take a look at your situation it seems you have two options:
1. attack the net and stay in. It would definitely work better than now if your partner were better at the back, but seeing as you don't we almost guaruntee you will lose these points once your opponents realise you don't cover the back, unless you manage to successfully kill most of the serves. This would be therefore a good option only if you are winning the majority of these points and only losing 1 or 2. Bear in mind when I'm playing mixed doubles (club level, county level etc doesn't matter) I love to see the man do what you're suggesting - its then so easy to pick on his lady and win the point. Even if he's playing with a really good lady, they are in the wrong position and I can prevent them rotating with my shot choice. One particular pair I know have done very well at some silver tournaments and their coach is always having a go at them for being in the wrong position. The girls a national standard singles player so she's not weak from the back, but by comparison to her partner she might as well be. But then again it works well for some international pairs particularly if the man is very devastating and tall (e.g. I am remembering Fischer-Nielson and Pederson - the Danes did this sometimes because Joachim was very fast at the front), and it doesn't work at all for others.
2. attack the net more conservatively and cover the midcourt and rearcourt. The risk here is that 1. your shot won't be good enough to start the rally safely and 2. your partner may not move in quickly enough to force the opponent to lift or drive the shuttle. If you do it well, you'll be in a good position from the start of the rally, and if you do it badly you are going to get caught in transition (i.e. the shuttle will arrive before you and partner are ready).
The choice is yours - there are no other options. You need to weigh up the risk and reward of each decision and decide which is best for you. You will win points and lose points as a result of each. In the long run (as in over the next few years), option 1 will cause more problems than option 2. If you learn to do option 2 properly with the partner, you become a nightmare to play against. If you stick with option 1, you will eventually have to transition to option 2 anyway, unless you find a good partner that likes this style.
I personally think the best option is to use option 2, and throw in option 1 once or twice a match to keep them guessing. Then again there may be other options e.g. play your shot then attack side by side with your partner - kill anything that comes your side, but still be in a position to cover both lifts, and your partner has to cover all drives and pushes to her side... Lots of options!