How old are you, buddy? Cause you can only have this opinion if you weren't there when Twilight Princess was first released. It is in no way "underappreciated."
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TP was what happened when Nintendo tried to course correct an actually underappreciated game (at the time), Wind Waker. WW was seen as childish for its cartoony artstyle therefore TP had ugly, grimy brown and grey color direction which was very popular with AAA games at the time. WW was disliked for straying away from Ocarina of Time, TP reverts to the OoT timeline with a whole bunch of references to it. Sailing was hated in WW so it's completely removed and goes back OoT mechanics and similar world map. Etc.
Nowadays, WW is much more well liked (it's rerelease with lots of QoL features also helped). With so many Zelda titles playing it safe, it stands out for trying so many different things. Its cel shaded graphics and cartoony art style has aged much better than TP's has. And so on. TP is by no means a bad game but it's exactly what a safe Zelda game would be. TP is that
demo from Spaceworld 2000 as a full game. The only thing TP has over say WW is
Midna, my beloved.