It is an ancient, powerful & mysterious mechanism to self-heal while gaining divine blessings of all universal Deities. The higher power has given us this sacred tool with which our bad deeds (bad karmas) can be vanished for good if approved by the Supreme. Additionally, is it a Nuclear Bomb as it can annihilate any form of Negativity by chanting Sri Rudram with love and dedication.
Sri Rudram contains great mantras to uplift your soul providing Bliss & Spiritual enlightenment. It contains the most well known maha-mantra (Panchakshari), Na-ma-ha Shi-va-ya, in the 8th anuvaka (section). It also contains many other great mantras like "Aum Namah Bhagavathe Rudraya", and "Tryambakam yajamahe sugandhim pustivardhanama urva-rukamiva bandhanan mrtyormukhi yamam mrutat" .
The Supreme certainly appreciates any one chanting Sri Rudram with love and dedication. But, there is just another layer of happiness, satisfaction & a sense of commitment from us when done systematically. Four things are very important for a systematic recitation of Sri Rudram - Tone, Breakpoints, Rhythm & Pronunciation (in order).