I Avast is so horrible, then what is so much better - McAfee, Norton, AVG, ....? Go check the forums of other anti virus software, you'll find they all get many complaints.
No software is perfect, but they all protect you from viruses (at least they try
) They all have their good and their bad, no difference compared to Avast. If you have a legit issue with Avast let the developers know the specifics. If it is a reasonable suggestion they might fix it in Avast, saves you an uninstall!
One thing they certainly won't do and that is have sleepless nights because of some generic "this is horrible, I'm going to tell everyone not to buy it" statement.