I followed flower7's suggestion of reducing the oil and vinegar and also used 15 oz cans of beans. I don't like a lot of thyme so reduced that to 1/2 tsp and added about 1/2 tsp of salt.
The quantities of this seem a bit odd (tons of oil & vin. for not much salad) so I adjusted them and thought it was quite tasty. I used 15 oz cans of beans and reduced the oil to 1/4 c and vinegar to 1/2 cup. I used black beans instead of garbanzo (personal preference). I thought it could also use a little salt but otherwise the seasoning was great. Thanks for the recipe!