Why is Julio Ceasar Chavez Such a Loved Legend?

[Chino]

everytime he fought someone decent he got found out (whitaker, Tsuyu, Taylor etc)

For Tsuyu, he was way past his prime. Taylor, won it clearly twice, can't see why doubt that one. Whitaker, yeah, no matter how much I love Chavez the decision doesn't convince me. I'll have to see it again sometime. Gift fight, maybe. But also a questionable draw against Miguel Angel Gonzalez.

The 'warrior' that all the fans loved quit? Am I missing something here?

It's pretty bad when fans get to idolize someone and don't see them as humans anymore. If he quit, he had his reaons. So what! He was hurt, tired, frustrated, etc. I don't know the reason but he quit. Only he knows why. Still, it doesn't take away from all his ring accomplishments:
He holds records for most successful defenses of world titles (27) and most title fights (37). ESPN recently ranked him as the 17th greatest boxer in history.
Considered one of the greatest fighters in history, Chávez won six world titles in three weight divisions: WBC Super Featherweight (1984), WBA Lightweight (1987), WBC Lightweight (198, WBC Super Lightweight (1989), IBF Light Welterweight (1990), and WBC Super Lightweight (1994). Chávez also went undefeated for 93 bouts before his first retirement with a record of 104-5-2 (80 knockouts). World champions whom Chávez defeated include Jose Luis RamÃ*rez, Rocky Lockridge, Meldrick Taylor, Roger Mayweather,Lonnie Smith, Sammy Fuentes, Héctor "Macho" Camacho, Juan Laporte,Edwin Rosario,Greg Haugen,Tony López, and Frankie Randall, who had taken the WBC light welterweight belt from Chávez just four months earlier.

I've never seen Oscar quit apart from a liver shot he took against Hopkins so why do Mexican's love JCC so much more so?

Maybe because he was in the sport for so long and then suddenly you have this younger Mexican who happens to live in the USA come and beat him. How do you think the fans would feel? That's all.

(of course he's got a few gifts himself)

As well as gift looses: Mosley II, Trinidad, Mayweather (there are lots of mixed reviews about that one from many boxing experts).