Yes reviewing the background of the team is an essential part to be investigated before you tend to invest in any ICO project, as the project is dependent on the team that how much effort they put to make the project successful. And also your funds would be in hand of the team, so make sure the team is legit and won't going to scam or have any sort of intentions to just raise funds and not working on the project, in that case, the token won't be having any value in future & hence your investment will be wasted.