Marshall is lost in 90% of lines, I will have to check the other 10%.
The Benko is more than lost, of course.
For reference, you might want to check TCEC and other high-quality top engine databases.
White scores tremendously, way way above the average, in them.
NM Aww-rats has also done much and great work on the Colorado gambit in his Nimzovitsch defense series on youtube. It's the unsoundness of it that attracts me. I love to win with it against players that criticise it.
Does that mean (using your logic) that you hate to lose with it against players that support its use?