Muay Thai is good, very practical. But there are not many genuine Muay Thai gyms outside Thailand.

The lack of a standard 'MT' system/grade/belt/etc means that there is likely to be a lot of variance in quality among the different schools around the world. Some of the more 'standardised' (if I can use the expression) styles, like some Karates, have become more aligned in terms of quality.

The fact that Muay Thai is good does not have much relevance to your statement that TKD is shit though !!!!