To me the last time I thought our offense was actually fun to watch was 09-10 and even then that seemed like an anomaly, since it was more because of a few play makers than due to the actual philosophy. Since then we have had some very successful teams, but I haven't tuned in to a game because I was excited to see our offense in many years. A lot of years I think we, as fans, overlook our lack of offense because we win games with tough defense. Success and winning makes many of us (myself included, from time to time) forget about the "issues" of the team. Most years for as long as I can remember 20+ years offense has been an issue, other than the years when we have elite level play makers (Carmelo, Devendorf, Flynn, McNamara, Richardson, Hart, etc...) our offense is non-existent. Honestly, during some games this year I was reminded of watching a junior varsity girl's game, with all the dribbling on the perimeter and no progress toward the basket.
So I would argue that our offense has been bad for more than last 5 years...