this is very funny, but it also happened to me with a diff camera. once i realized that it's much harder to keep things sharp with macro (very narrow depth of field) - i went back to just zooming in with the lens (same 18-55mm) and not too close either! i then crop to get a pretty good macro without a 'macro setting' and worrying about depth of field.
my old canon EOS had double depth of field settings which i always used to keep things sharp where i needed.
all this talk and photo postings made me think that i finally need to upgrade my canon to digi-body.
like, been thinking for at least 2 years and just sitting on my hands - can't decide which one to get....and too lazy to go read thru all the reviews. but really it pays to know what you get vs what you're missing! model by model.