nomotiv,
There is an old saying as a statement of maturity:
Never take your toys and go home.
No matter how negative your chapter, or the people you perceive as idiots representing your national, you can still be the best fraternity member you can be.
If your members drink to much . . . you don't have to.
If they don't want to do service . . . you can.
If they don't want to be gentlemen . . . you can still act appropriately.
Use the Nike motto: Just do it.
If you develop enough personal prescence you'll have people saying wow, everyone should be like you

.
We actually had someone do that here to a degree. In another Fraternity on our campus th members did not want to do community service, so he asked the Greek Advisor what he should do (he was the CS chair).
The advisor answered: You want to do service? Do it.
After a little while of sitting at tables by himself, suddenly he had more help than he could handle. It turns out that people (especially sorority women) were stopping his brothers in the hall and asking why one of their brothers was sitting at a table, raising money, by himself . . .