Basicly, the two main markets did much lesser than for CATWS and GOTG (granted it does $80+M in China).
TTDW did $206M in the US. But it also did $55M in China, which was not only lesser than CATWS, TASM2 and DOFP but also lesser than previous CBMs within the last 18 months pre TTDW release, aka TA, IM3, MOS, TDKR and TASM2 (both released during the same date),
Compared to CATWS, that's $50M lesser in the US and $60M lesser in China.
So removing China from the picture and you have TTDW basicly edging both GOTG and CATWS on the foreign front.
For some strange reasons, on the foreign front, it just really underperformed solely in China compared to other CBM and was in better position than both CATWS and GOTG to reach $500M overseas, if it wasn't for China underperformance.
Globally Thor appeal seems to be second to IM when it comes to the MCU if China is hopefully proven a punctual anomaly with TTDW. Thor has had the biggest foreign gross edging slightly IM when it comes to the first movie release. So it's foreign appeal is there. It just needs a great movie and finally a breakout in China like most CBM are experiencing these days.
As for the US, granted it was less stellar than both CATWS and GOTG, i believe, CF, Frozen and then Hobbit, killed its mometum prematurely.