Sure, for versimilitude or realism. The main reason why spears were used to equip armies wasn't that they were cheap and inferior, it was that a guy with a spear was MUCH more dangerous than a guy with a sword. It's especially true of unskilled fighters and was even true of elite fighters. If you look back at actual history rather than trying to make guesses or comparing modern techniques with modern reproductions of the weapons, most elite fighters (in pretty much all cultures: Japanese, Chinese, European) carried swords as BACKUPS either to bows or polearms. Groups of people with spears are also remarkably more useful than groups of people with swords.
Unfortunately, the other side is that it's really hard to make combat with polearms look cool. You want vicious in-fighting in most media, not long-range poking. Fighting games and such make use of spinning and even vaulting with polearms, but a lot of that looks ridiculous even for a video game. Your range of motion and ideal range of engagement with a polearm just makes combat decidedly less dramatic.
So in short, yes to polearms for variety and realism, but only when the combat isn't intended to be too flashy. Or when it's intended to be so flashy that you can add ridiculous-looking moves into the mix. Polearms are great for games like Morrowind (and they WOULD have worked well in Oblivion), but they're not what you want for games that are trying to be realistic (ruling out the ridiculous moves) and dramatic (generally favouring close-up, more intense fighting).