Akshay Kumar stayed fit and stayed out of nonsense throughout his career. He had a versatile portfolio where he can do a completely comic role and also a serious action hero role.
If you see the timeline of Akshay’s movies, in the early 90s, he played mostly action oriented movies with some romance. The likes of Main Khiladi Tu Anari, Khiladiyon ka Khiladi, Mohra and Yeh Dillagi.
In between, 1997–1999 he acted in 9–10 movies which flopped. He even did cameo in Dil Toh Pagal Hai which was an out and out SRK movie. Only Dhadkan was a hit in 2000 which was a serious movie.
Starting 2000, Akshay shifted to comedy movies such as Hera Pheri, Aawara Paagal Deewana, Namastey London and the types. His market was steady from 2003 - 2010 when he did movies like Bhagam Bhag, Heyy Baby and Welcome. Most of these were mindless double meaning comedies with the combination of Paresh Rawal, Tushhar kapoor. The genre was nevertheless a hit.
His peak was the Bhool Bhulaiya, the Housefull series and Tees Maar Khan which ran just for the songs and comedy. Akshay was a bankable actor and many producers were willing to bet on him.
Compared to that, Sunny Deol and Sunil shetty can do only serious action roles. The trend of bashing up 20 people or firing guns in border faded out in mid 90s and definitely in the 2000s. Romcoms and the Khans dominated the Bollywood market from 2000 till 2012. Akshay found the sweet spot where he could do romcom and comedy which was appreciated by the Bihari, Rajasthani, UP audiences.
Sanjay Dutt was doing fine until he attempted the remake of Tamil and Telugu movies. He managed to sustain his market with the Munnabhai series but often ended up in jail due to the 1990s arms case. In my opinion, he spent more time in jail for the crime of having a weapon which he told he had to protect his family from underworld. His drug addiction also ruined his prospects. He is a good actor.
So, Akshay by switching to comedy and romcom genre when the need was there and sticking to perfection and healthy lifestyle continued to be successful well until 2015. After that, his movies have been failing except for 1 or 2 movies. In the last 3–4 years almost all his movies have failed.
