I think basically everyone (other than the luckiest among us) who has ever had a job has at one time or another felt that their team wasn't professional and/or pulling their weight. To address your thoughts:
You described your colleagues as falling into two different categories:
1) average students. Average at everything basically. Not bad in any way, but just... not great either. Cannot have an intellectual conversation with them.
By this, I assume you mean that your colleagues lack the expertise necessary in order to be effective collaborative partners -- If this is the case, then it sounds like you should find a new research lab. The whole point of working in a lab is that you're on a team of people with specialized expertise in a research area. If you have a question in your research, ideally there is someone in your research group who has experience in that area and can give you valuable insights. If nobody in your research group can provide this to you, there is very little value in being there other than receiving a paycheck.
2) Very smart, but not hard-working. Takes short-cuts etc. Essentially someone who is very good at talking the talk, but not really walking the walk.
I am assuming that what you're saying here is, my colleagues are capable of contributing valuable intellectual horsepower to our research projects, but they don't perform their day-to-day duties --If this is the case, then it's really no different than someone not doing their jobs in a normal workplace. Even though you see your lab manager as someone who "sees this as nothing more than a job that pays the bills", you should bring it up with her as you would any manager.
I do want to point out something else. It sounds like some of the issue here lies with your attitude about your team and the workplace culture of your lab. I think you're being a bit unfair to your teammates. Keep in mind that doing research in a lab is very different than doing research as part of a graduate degree. You're now working in an office setting, so the attitude of the lab is almost always going to be more "business" oriented and less "hungry" than research you did as part of your graduate degree. In that same vain, good workplace habits apply in a research lab just as they would at any other place of employment. So, if you're saying that your research lab is full of people who, "are really not the brightest group", that tells me that you don't really have a great attitude about teamwork in general. Keep in mind that these people have normal lives. Most of them are probably not really interested in making a huge discovery or working 80 hours / week to publish something unbelievably cutting edge like they were in graduate school. To me, that is actually a sign of maturity as a researcher rather than a negative.
Basically, my suggestion is to take a step back, and reflect on how you can improve your lab rather than focusing on why the experience not being perfect is because your labmates are intellectually inferior. If it really is the case that your labmates don't possess the expertise necessary to be effective collaborative partners, then leaving the lab is a perfectly reasonable choice. Also, every lab has a different work culture. If you would prefer to work at a more intensive lab, that's always an option. Otherwise, it sounds like you may need to calibrate your expectations a bit, and ask yourself what you can do to make it a better experience.