do you already have a single score for each one? you could just take scores and average them. use a weighted average if you think certain services' scores are

do you already have a single score for each one? you could just take scores and average them. use a weighted average if you think certain services' scores are more important than others. is the problem they're on different scales? you already said you wanted 0-100, so just turn all the data points per service into percentiles, then average said percentiles to get a per-person score. there are of course a zillion other ways to do it depending on what exactly you have and what you want...