I personally hate 401k because it's a bureaucratic flaming garbage heap wrapped in federal red tape. That said, I've had to run our corporate 401k for years and the reason I set that up was at the time it was the easiest way for me to come up with some sort of equity/profit sharing for our employees. The downfall was when it was very new and our acct was just starting relatives of ownership could not really participate (long story). Anyways, the options are poor, the returns are poor.
I believe another option you could consider if you're up for it, is borrowing against your 401k and investing that money you borrow into a different account. You would have to pay back what you borrow to your 401k, and with interest, however the interest is paid to YOU. so if you borrow say $5k on a 2 year or 4 year note or whatever it is at 4.5% that 4.5% is actually just you paying yourself back and your $5k you borrow from your own account you can invest in higher yield options.
Is it possible to get the money that they invested into it refunded, minus the "matching" money?
This part is more complicated for 2 reasons:
a. depends on how your company is setup. if there is a vesting program you'd lose the matching most likely. For example our vesting is a 5 year program. We do an annual "discretionary" contribution to our contributing employees after Christmas. it's our form of "profit sharing" but it's called discretionary matching. if you are a 1 year employee and leave our company or the 401k, 20% of that is yours to keep. if you are a second year employee, 40%. and 5 years, 100%. so if you are in the 401k for 5 years you are fully vested and any contributions the company makes are yours to keep.
b. employees are required to participate in the 401 to receive discretionary contributions. so if there are 100 employees and only 20 are participating and $50k in distributed all $50k goes to the 20 that are participating and 0 to the 80 that aren't. so that's really where you get your ROI on 401k. company contributions.
Lastly, if you pull out your 401k just as a cash out, rather than a loan from your account, you will pay income taxes on it and I believe the additional penalty is 10% on top of that.
there are creative ways to use your 401k but walking away from it entirely is the worst case scenario.