I wouldn’t worry about the fact that it’s a closed-end fund. I would be more interested to know what is their performance, what securities they mostly invest in, what kind of shares do they have, how liquid their shares are etc. Closed-End funds tend to be specialized in specific securities (either geographically or industry specific). They can have really good returns and you can enjoy a good capital appreciation if you are patient.
Bear in mind, that a difference with open ended funds is that their price is not directly related to the NAV (Net Asset Value) but it is derived based on the supply and the demand of their stocks. Therefore, it might be worth trying to find undervalued stocks of closed-end funds as well.