I never really looked at Minsc as a ranger and I never used his stealth and dual-wielding abilities, or even the divine spells (it always sounded dumb to me that he can manipulate magic actually). I rarely use also his bow abilities, since I always preferred a mage/thief like Nalia or Imoen for support at a distance (especially in later stages with Gesen's and Tansheron's bows) while he was tanking in the front line.
I always gave him a two-handed sword and heavy armor, sometimes a mace or an axe with undeads, thus ignoring those skills (except for some times using the bow when I didn't have anybody else around). Neither his character was really a ranger to me, more like a big crazy bodyguard with a passion for big swords and an innate fury.
Now I'm starting also to mod him with ShadowKeeper and convert his class to a berserker, it really fits better to his personality IMHO. Anyway, I trade his free dual-wielding proficiencies, the racial enemy and one point in longbow proficiency with the ability to reach five stars in sword skills, the stealth backstabbing and the spells with more fury.
The only thing is that he still refers to himself as a ranger in dialogues, but it's really irrelevant and I can turn an eye blind and even the other to that.