I know that good graphics don't necessarily make a good game. But they can enhance the gameplay experience, which is what TP did for me. If the plot and gameplay had been crap, I would've liked looking at it, but I wouldn't have played it for very long.
There. You summed it up perfectly.
Reasons for loving TP:
Midna/Link Relationship
Midna, period. lol
Twilight Realm
Wii version is awesome ;3
Pretty Graphics
Best Castle Town in the Series
Biggest Enviroments/Landscapes
DOUBLE CLAWSHOTS
Dearker Enviroment/Mood/Story