I've killed and ate close to 2 dozen feral hogs in the last 10 years since I moved to texas. I've never had one taste bad, including some stinky boars and one that weighed over 240 lbs. Much like bears, I think any off taste has more to do with what they are eating than anything else. If they've been getting into some carcasses left by another predator its going to affect the flavor. If they've mostly been eating forage with some corn thrown in they'll be fine.
A big boar will be tougher and I do prefer 120-140 lb for eating, but that big one and several over 180lb were fine, just tougher like any older animal.
I treat them like anything else. Skin them, be careful not to get hair anywhere on the meat. Quarter, take backstraps, ribs, and tenderloins. I don't usually take the neck meat, but that is mostly b/c skinning down the gristle plate on a big hog is a pain in the butt and I'm lucky that it's easy to take a couple pigs anytime I can make a trip to this ranch. By the time i get everything else off I'm ready to be done.
Keep them on ice until I get back home. I don't like to soak them. Yes draining the blood via soaking in ice (as is popular in texas) will take out off flavors, but it will also take out any flavor at all.
when I get home, I debone, being careful to get out all of the glands that are found in both the front and rear quarters. If i nick a gland, that knife gets a solid wash before it ever touches meat again.
I usually keep the backstraps and a couple large cuts of meat from the rear quarters for roasts. If it is a big pig and tough, I will usually pound them flat for schnitzel or the like.
Sometimes I keep a front shoulder to braise for pulled pork. Ribs get braised and finished on the smoker or grill. The rest gets made into breakfast sausage and I usually just use uncured bacon to add fat.