I'm not really going to structure my review for this, and instead use this as an impression dump. "Vettayan" was definitely the best Rajni movie since "Petta", but it's also the case that there just hasn't been a half decent Rajni movie since "Petta". "Vettayan" does its best to hold ground, but it still ends up being a rather tiresome watch. The main reason for this is just how long this movie went on for when it didn't really need to.
The first half was pretty good and while that might have been enough to keep your attention for a while, the second half fumbles the ball as soon as they reveal the direction of the movie. There's nothing here really that you haven't seen a million times before, but at the very least, there wasn't anything embarrassingly bad... except maybe the action, as has been the case in every Rajni movie, where the best action choreography you could do with a 70 year old man is to get him to swing his arms and flick his wig.
It's a passable movie for sure, and by Rajni standards, that's a good thing.