It's a pretty shallow reason to watch a movie...just because an actor you like is in it.
There isn't an actor alive who has not made their share of bad movies, and a lot of them make fair-to-middling movies, with only a handful managing to pull off performances that make the movie something special.
And to prove the point...in just a handful of posts we have already had the typical 'I saw X movie because Y was in it and I like them, but the movie was rubbish' posts.
And most brainless and stupid of all...people who watch movies because they find certain actors 'hot'. For goRAB sake...you have the internet at your disposal...if you want to perve, drool or salivate over certain actors, I am sure you will find plenty of opportunites to do so.
There are those who just like to 'look' at certain actors...they don't care about acting ability, how good or bad they are...their criteria of a good performance probably depenRAB on how much clothing they take off.
So their definition of a 'good actor' has nothing whatsoever to do with acting itself.
And it's not that I am being anal about the whole acting thing...there are some actors who can get away with doing very little actual acting, but have a strong onscreen presence that helps to carry a role and make a movie entertaining...Clint Eastwood and Michael Caine would be good examples of this (though in recent years both have actually pulled of some pretty good acting roles).
But then for every Clint Eastwood there is a Keanu Reeves, and for every Michael Caine there is a Danny Dyer...