Let me ask you, how much water orc wizards you see? Or ogre wizards? Or maug wizards?
....
So for me race is just another choice for your character. Just like the wizard doesn't pick water orc and sets his own Int score on fire.
In a Western Marches game, I'm actually playing a perfectly logical Water Orc Battle Sorcerer that crushes his enemies before him and hears the laments of their women. Water orcs are strong, and value strength. Magic can make you stronger. Did I mention that he's easily the most powerful character in a group of 5 sorcerers, 2 wizards, 2 druids, a ranger, a monk, and a cleric? His race, while not actually benefiting him all that much, does help him as a character. Let me describe the sorcerers in this party. The first four of these actually joined as a group, and together tried to make a self-sufficient balanced party of their own so that splitting the party would be easy.
Nael Remmington: Human sorcerer, stated goal: "Learn about the Eastern lands." Likes blowing shit up. High mental stats, low physical stats. Other quirks: he thinks he's a wizard, so he carries a spellbook even though he doesn't need it.
Finny Waymottin: Gnome sorceress, stated goal: "Become more powerful." Her favorite tactic is to disable enemies and then nuke them. High mental stats, low physical stats. Other quirks: she doesn't mind murder.
Corina Chillblood: Human sorceress, stated goal: "Learn about higher magic." Every single spell they know is a buff or utility spell. High mental stats, very low physical stats. Other quirks: Is from a society that doesn't care about clothing. Also, they're from nobility.
Arrus: Halfling Sorcerer, stated goal: "I want to see the world." They like dealing lots of direct damage. Every stat is a dump stat except for Dexterity and Charisma. Unlike the others, they actually sneak around and such.
Maelrigar Desraktu: Water Orc Battle Sorcerer, stated goal: "I want to find the fire elemental that attacked my tribe and tear it asunder using my awesome power." Maelrigar is my character, and in battle he charges in headfirst, greatsword leading the way. His strength and constitution are through the roof, and he only keeps enough base charisma to cast the highest level spells he can cast. To circumvent the low save DCs, he only uses spells that don't require saves. Orb spells, buff spells such as Fist of Stone, and Whirling Blade are some of the most used. He fights better than the fighter, his spell damage is more consistent than the others, and he can actually pull his own weight.
My DM just glanced at Maelrigar's sheet, nodded, and sighed to himself, quietly muttering "another damn sorcerer?". When he made a pillar fall towards the squishy members of the party, you can bet he was surprised when I asked if I could dive at the pillar and knock it out of the way. He was also surprised when at level 3, Maelrigar fought a CR 6 giant cave spider to the death, using only one spell. Using Whirling Blade to slay 12 enemies at once in a hallway was pretty memorable too.
Forgive my tangential anecdote, but what I'm trying to say here is that an 'odd' race can make a character much more interesting. Whereas the other 4 sorcerers are just, "meh, I like to cast spells and learn", my character has some flavor. Maelrigar is a Water Orc, thus, he dislikes creatures of the plane of fire, as they are continually at war. Cue him worshiping an ocean god and using mainly lightning, water, and strength based spells. The Water Orc theme goes really well with a Gish, I must say.