To say that Tatsunoko vs. Capcom faces an uphill battle is a gross understatement. Despite the massive success of Street Fighter IV, fighting games tend to be a niche genre populated with hardcore devotees who will inevitably spend hours playing and learning every facet of the game. For them, Tatsunoko is a no brainer; it looks good, plays excellently and offers a fresh, fun take on the combo centric play of the vs. series.
For everyone else, it's a newbie-friendly fighting game on a console with no fighting game fans, populated with unknown '70s anime characters. No matter what happens at retail, Capcom should be applauded for having the confidence to bring TvC to the states - it's an excellent fighting game that deserves to be played despite its commercial handicaps.