By reading the Wiki I learned some interesting things...

1) Grunts and Jackles ALWAYS hate eachother
2) Grunts and jackles are a slave race that are treated as second class citizens and have absolutely no freedoms civilly and politically...
3) there is a legit race of hunters that look like elites... But are more badass
4) grunts needed their planet to be almost glassed to stop their rebellions... Even Elites couldn't handle their shit... +1 for grunts
5) Grunts don't believe... They're just in the covenant out of fear and hate all other races... -1 for grunts
6) Elites are assholes who don't care about grunts or jackels... Often ignoring their political cries...
7) there are some other scary fucking aliens in the covenant
8) Jackels are mainly a pirate race... Nice!!! 
9) I can own a Doberman Gator?! WUT?!?!
10) Hunters just don't fucking die... And they cry when their "brother" dies...