Typically they are viewed as a cult by some and just another religious group by others, many don't see them as "christians".
Those that know about their blood policies find them confused and dangerous and "mind controlled".
People who know JW's tend to find them polite and reserved, those that have been exposed to JW' conversion tactics find them knowleable about the bible compared to most other religious people ( except Muslims and Jews) though they tend to disagree with most of their doctrines.
Some find their door-to-door preaching bothersome and feel that it is a negative aspect of that religion.