The first one’s worth a rewatch.
The rest? I quit after 2. ‘Nough said.
MI2 was definitely the low point in the series. I attribute that to John Woo (the director) more than anyone else. His style might be good for a Hong-Kong type action film, but was just out of place in an MI movie.
If you liked the first MI and action films in general, I recommend giving the rest of series a try.