For a display advertising campaign, 0.1% is a respectable click thru rate. That works out to 1 click per 1000 ad displays. Facebook ads often generate click thru rates that are much higher than that but keep in mind that you need to take Facebook’s click thru stats with a grain of salt as they count a lot of events as clicks that one would not typically consider to be a click which artificially inflates Facebook click thru rate numbers.
Google happens to have a terrific resource for evaluating how well your ad campaign is doing in relation to campaigns from other organizations in the same industry. You can view display benchmarks according to Google here.