Thadaiyara Thaakka is an outstanding, refreshing, raw action thriller that is absolutely worth a watch. Arun Vijay's performance is impressive, given how perfectly he balances himself playing a commoner as well as an action hero. He has given it everything he's got and has come out with a memorable performance. Watch out for him in the action sequences where he comes through with flying colors. While Mamta Mohandas doesn't have a highly integral role, her performance is good. Special mention should go to Rakul Preet Singh who delivers a grounded performance as a vulnerable, scared lady as well Vamsi Krishna for playing the antagonist with finesse.
The film works by most standards because it doesn't waste the first half with overdosed romance, comedy or songs. It has those elements but in a minimal and balanced manner. Being first and foremost an action thriller, the film has a suspenseful tone from the very beginning and is also replete with raw, realistic fight sequences as it unfolds. The basic plot might appear a simple one, but it's actually very layered. Director Magizh Thirumeni has made this film very effectively; he has used the smallest of roles in the most intelligent way. Thaman's music is cool and stays with you even after the credits roll. The theme song in particular stands out and is befitting for an action film like this.
If you want to see a well-written action thriller that doesn't waste any time, watch Thadaiyara Thaakka. I know it might be hard to, but try watching the Tamil version. I myself watched it in Hindi on YouTube, since the uncut Tamil (this is an A rated film due to the violent action) version is hardly available with subtitles. If you come across it, you'll be lucky! This film deserves even more praise and attention from viewers.