I had no idea that Mario Bros. 2 was THAT much of a copy of that... other... game. o_O I knew that "Lost Levels" was the official Mario Bros. 2 (just released in Japan only at the time), but I had no idea that Mario Bros. 2 (released here) was an exact replica of that Panic game. Sure, I heard they had similarities... but that was as far as I did my research.
This still doesn't change my views much at all. Mario Bros. 2 is still one of my favorite [Mario] games, and Toad's one of my better team players for possessing speed and power (just little jump ability).