List of his movies that are based on Hollywood films

Ghajini was a BAD and TOTAL rip-off of Memento. The main hero suffering from Short Term Amnesia uses tattoos, photos and notes to oneself to locate and take revenge on the man who murdered his wife. It doesn't get more obvious than that! Maybe YOU are the one who needs to watch Memento again.

Just because Bollywood added a few dance and songs and increased the amount of romance does not make Ghajini an original movie. Just for your information, EVERY Bollywood movie that was copied from a Hollywood movie (and there are a LOT!) is ALWAYS worse than the original.

As for the original question, there are many films of Aamir Khan which are copied from Hollywood films. Apart from the ones you mentioned:

Qayamat Se Qayamat Tak - Romeo & Juliet
Jo Jeeta Wohi Sikandar - Breaking Away
Hum Hai Rahi Pyar Ke - Houseboat
Aatank Hi Aatank - The Godfather
Andaaz Apna Apna - Dirty Rotten Scoundrels
Raja Hindustani - copied from Bollywood movie "Jab Jab Phool Khile"
Mann - An Affair To Remember
Fanaa - Eye of the Needle
Taare Zameen Par - copied form a book called "In the Wonderland Of Numbers".
Talaash - Insomnia, The Sixth Sense and Shutter Island

There are also many films like "3 Idiots" which have copied entire scenes from other movies. So almost a quarter of Aamir's movies are totally or partially guilty of plagiarism. What a shame!