I agree, the first installments of fighting games usually have the least amount of playable characters:
Street Fighter: 2(well, depending on P1 and P2)
Mortal Kombat: 7
Virtua Fighter: 8
Tekken: 8
Battle Arena Toshinden: 8
Soul Edge: 8
Power Stone: 8
The only two first games that had a large number of characters were King of Fighters(24) and upcoming Dissidia(20). But, KoF is team battling, hence it's natural the roster should be large. Dissidia, well, considering it was suposed to be a celebration for the entire FF series, and there ARE a lot of FF games, it's natural to they are going to add a lot of characters throughout the series.
So yeah, 14 IS a generous number.