You will have troubles if you are under 0.5%.
Anything over is good. The higher you go, the less you are paying.
5-6% is nice, but the main thing is, if that particular word (or phrase) is making profit to you?
Do you sell anything? Are the users, who clicked, converted to the customers?
So, I would say, that very good question was asked after you woke up :-)
There are some semi-generic keywords that get a lot of hits, but no conversions.
We have some with a 1% CTR but 50% conversion. We have some with 5% CTR but almost zero conversion (which we are gradually weeding out or adding negative keywords to).
We have a couple of KW that get like 5 hits a week, but nearly 100% conversion. Wish I could think of about 100 more like those.
We found out that CTR is pretty meaningless taken alone. ROI is what counts.
Agreed, in many ways at least. Still, a high CTR can contribute to better positioning at lower cost - which may have it's own positive affect on ROI. ;)
Is between 5% and 6% a respectable CTR?
Atipsy, I'd say that average runs around 2%. So 5% to 6% is very respectable indeed - but not extremely high. I've seen lots of advertiser's routinely push into the double digits, with work and attention.
AWA