Risk tolerance and appetite is a difficult to gauge for another person, entity, or process without knowing the environment details.
Simply- How important is your data you are communicating over PPTP vpn?
Then, does PPTP provide sufficient protection to match up with how important you assess your data.
Currently PPTP is under scrutiny because of the level of protection afforded is relatively low compared to other VPN controls and there is the availability of automated tools which can be used to defeat the PPTP VPN controls.