Though I don't generally work with deities, and most contact with entities I have is done through their initiative, I'd like to say they don't always deserve it. Some paths have had their more 'darker' entities thrown down into being evil like Loki, the Rokkr, Set, Anubis, and countless others. To many who worship/work with these entities they are not evil, maybe darker than some, but not evil. It really depends on the path itself, and the person following said path.
However, it seems now a days that deities are seen in two sides, instead of in varying 'shades of gray' like they were usually seen in the old days. This may be in part to Christianities dormant effects of those who converted to other faiths, or do to other beliefs, experiences, or the information (whether false or not) the person may have.
I try not to ever presume and entity is one way or another until I have met/felt them for myself. Even when one may feel 'evil' to me, I still try to understand their point of view, see myself in their shoes, in an attempt to gain my personal judgement of said entity.