Personally, when its an image that is an actual dad joke I find them amusing.

I think a much better requirement would be that the image must actually be a dad joke. There's been one or two I've seen recently that definitely tiptoes the line between "a dad does this" and "dad joke"

but I also think looking at the recent jokes, I much prefer them in image form over text form as it adds context that normally would have to be added via words.

Like I do agree pictures that are strictly text and add no other context are annoying but, for the most part the images usually add to the joke.