My first and only Mega Man game at the time of writing (got Network Collection but not played it yet. Soon hopefully. RIP Legends 3). The music from the Japanese trailer hooked me. Despite the review warning me that it was hard, I took the plunge and enjoyed it. From the unique mechanics of using chips that you can organize to fight to the awesome soundtrack (with the Zero EXE boss battle remaining one of my top favs).
In the end, I've used Action Replay for the last few stages but it was good that I made it this far. It would be interesting to see how well I do if I were to play it now. But regardless, it's one of the couple Mega Man games that has never been re-released (again, at the time of writing) and deserves a second chance.