By it's nature, a worth-while "automatic" QoS is not really plausible. QoS depends on guarantees (latency and/or bandwidth), and if you are using automatic, dynamic traffic classification, you simply cannot depend on it because it may change the relative traffic priorties at any time. If the automatic QoS is proprietary, that is another level of unknowns.
There is fq_codel/codel, which is a "no knobs" algorithm for network buffers that improves worst-case latency (primarily for upload traffic), but otherwise you need to setup the bandwidth allocation manually and generally understand QoS fundamentals.
Most people need a very simple QoS setup, like prioritizing VOIP, which is very simple to setup with standard/traditional QoS. If you have complex traffic-shaping needs, I would look to tomato/ddwrt, pfSense/IPFire or an EdgeRouter X. AsusWRT seems to be hit-or-miss with it's QoS, partly because of the limited GUI.