To keep chanting the mantra that you don't like ATC's is pointless, unless you state exactly which components you heard through them, and in what environment. ATC's are regarded as near as damn it transparent. That is precisely why they are used as monitors in the highest level. Much more likely is you could hear the other electronics in the audio chain. Crap in = crap out. The ATC's won't make an oil painting out of a harsh recording, or improve a poor miss match of front end electronics. They only tell you what is going on. Good or bad.

For example, I spent an enjoyable weekend swapping over various pre amps into the three way active ATC 50. The difference just each pre made was staggering. Some were very clinical, flat, tight and accurate. Others were a riot of sensation, with instruments leaping right out from the cabinets confines. At no point was I listening to the ATC's. I was hearing the recording and the front end electronics. You can COMPLETELY change their perceived sound accordingly. Tailor it to your own personal taste. This audio honesty makes auditioning other components much easier.

Either state exactly what components you were listening to (through the ATC's) or maintain a more balanced opinion. It's like looking through a glass window to a horrible view, then blaming the window itself.