The Importance of Mars in Mangalik Dosha

Astrologically Mars is seen as a cruel planet. Mars happens to be natural significatior of Stamina, courage, anger, desire, opponents, immovable properties, friends, enmity, energy, violence, cruelty to name a few. In terms of Marriage it acquires supreme importance as here it signifies Passion, the Husband, the Marital Knot, sex, etc. Further, the role of Mars in begetting progeny cannot be underestimated.
Formation of Mangalik Dosha in the Horoscope
As per astrological, Mars placement in the 1st,  4th, 7th, 8th or 12th house from ascendant.
Mangalik Dosha and Planets
Mangalik Dosha is considered from the Ascendant as it signifies self, health, longevity, appearance, character, success and failure in life among other things.
Mangalik Dosha is considered from the Moon as it signifies Mind, emotions, infancy, personality, bovines, inclinations and emotions.
Mangalik Dosha is considered from Venus as it signifies marriage, sexual matters, love, beloved and bed pleasures. 
Cancellation Of Mangalik Dosha
Following are the cases where Mars even if it is in  12th, 4th, 7th or 8th house the manglik dosha gets cancelled: - 
1. When Mars is in its own sign (Aries, Scorpio), exalted (Capricorn) or in the houses owned by his friends (Sun, Jupiter, Moon) manglik dosha gets cancelled. 
2. If Mars is in the 2nd house but in Gemini, Virgo sign no dosha. 
3. If Mars is in 12th house but in Taurus, Libra no dosha. 
4. If Mars is in 7th house but in Cancer, Capricorn no dosha. 
5. If Mars is in 8th house but in Sagittarius, Pisces no dosha.
6. For Cancer and Leo ascendant Mars is a yogakaraka wherever it may be no dosha at all. 
7. For Aquarius ascendant Mars in the 4th/8th house no dosha. 
8. If benefic Jupiter or Venus is in ascendant no dosha. 
9. If Mars is in conjunction or aspected by Jupiter or Moon no dosha.
10. If Mars is in conjunction/aspected by Sun, Mercury, Saturn, Rahu no dosha. 
Thus we see that percentage of manglik cases decreases if we consider these factors. 
In consideration of marriage, various factors other than manglik dosha should be carefully be examined for a long and successful marriage.