It's funny, adequate seems to have negative connotations, when really it is quite literally, perfectly acceptable. To Me, Adequate meets my requirements. Excellent, or better than adequate always exceeds them. A typical mid-size sedan has adequate rear leg space as per my requirements. A larger sedan such as a Genesis would exceed them and be considered to have excellent rear leg space.
THAT being said, the requirements change for the class of vehicle. I don't expect a compact sedan to necessarily have enough rear seat leg room to fully meet my requirements. I understand that if someone tall sits behind me, I may be required to move the seat up. Therefore, most compact sedans would be considered 'adequate' for the class, based on that compromise. That being said, I consider it a standard of the Mid-size class to have enough leg room for two tall people to sit one in front of the other without any issues. Any mid-size that compromises on this value is deficient in that regard. A Full-size will allow two tall people to sit in one in front of the other with inches to spare.
Ergo, an IS fails in the rear seat room as a mid-size sedan. It wins in so many other areas, but not rear seat room.
OH, and I can add the Legacy to the list of cars that are adequate, too.
