1. Seated Leg Extension
If you do too much weight, it can injury your knees. It's best for warm up sets.
2. Seated Military Press
Behind the neck presses are unnatural movements, so it better to do them in the front. I don't see this machine as being a problem. Using a medicine-ball is not going to do anything for your shoulders.
3. Seated Lat Pull-Down (Behind the Neck)
Once again... behind the neck isn't a natural movement. Doing it in the front is best.
4. Seated Pec Deck
If you are having shoulder problem and this exercise hurts, then don't do it. Other than that, it's still a good exercise to include in your routine.
5. Seated Hip Abductor Machine
I agree with them on this one. I never recommend them, and yet gym trainers always tell women this is a good one for them to do. If you are doing squats and lunges, then you don't need this machine.
6. Seated Rotation Machine
Another worthless machine that trainers like for women to do. Stick to the basics... crunches and sit-ups always work best.
7. Seated Leg Press
Squats are always the best exercise for legs, but this one is a good alternative. However, you shouldn't use this as your core exercise.
8. Squats Using Smith Machine
I agree with them on this one. SM can add stress to the knees, shoulders and lower back. Better exercise is regular old squats.
9. Roman Chair Back Extension
I never got much out of this machine. I think the back extension bench is a much better way to do them. The back extension bench I think is what they are calling the "Roman Chair Sit-up".
10. Roman Chair Sit-Up
I don't agree with the on this one. Some people have low back problems and if this machine hurts, then don't do it. It can put stress on it. I find it makes my back feel better. It will really depend on the person.
...just my 2¢.