A lot of suggested tags I get can be good, but are often missing a word in between for some reason. The words suggested are in the context so it is relevant, but can adding to many be harmful,good, or neither?
They are only suggestions. Many will do you no good because no one would actually be searching for those precise keyphrases that comprise the tags. So, just use them as a guide, and if you really want to check them out, and have the time, run them through the Google keyword tool.