I watched this film in cinemas yesterday and there was not a single moment where it felt dragged or exaggerated. Valimai is a fun action entertainer with a good message. Its high-quality action sequences are an absolute treat and the big screen is the right place to enjoy them because everything's as promised and advertised by the makers. Ajith Kumar's fantastic screen presence is another reason one remains glued to the screen. His bike stunts are top notch, and emotional moments, touching and resonant. The music doesn't interrupt the film's pace, and the background score elevates the fun to the next level. It has a very good pre-interval action scene, but aside from that, the film also has an outstanding post-interval action sequence which is in fact my favorite scene in the whole film.
The length is long, but there's no deviation from the storytelling and hence the time flies by real quick. Ajith Kumar's character is more grounded than his previous roles here; he is strong but also vulnerable. He is heroic and yet no superhuman. His commitment to justice is very well portrayed on screen. As for the villains and supporting characters, Kartikeya Gummakonda and Huma Qureshi have their own moments where they shine from time to time. Two villainous cops are portrayed by some fine actors who succeed in making us hate them. On the technical front, the film's cinematography and editing are fantastic. Action scenes, as I mentioned before, are fun to watch and the film's major highlight.
On the flipside, some might find the climax unconvincing. Other than that, it's a perfect cinematic treat for fans of Ajith Kumar and the action genre in general. I watched the Hindi dub and it was pretty good.