1) it worked first time without looping back again and again and again
2) it didn't discriminate against literately written posts eg paragraphs and punctuation
3) it didn't use visually distorted words - this is hell for visually impaired people like myself
4) it actually worked to keep the actual spammers out, which I assume is it's primary purpose, and it doesn't
I readily appreciate the need to prove I am human and not a spambot, though why can't that be done with efficiency and without word distortion as on other sites I visit? (Also, unwittingly I am sure, the distortion is discriminative against people with visual impairments). I am not visually capable - I have the wet form of macular degeneration and other visual impairments, and Catcha is a real downer in my day.