I guess I'll do these in order of importance:

1. The patty was insufficiently soft. Chewy. Decent seasoning though.
2. There were literally two roast beef slices in there. For shame!
3. The sauce, though decent-tasting, was very heavy. Deadass consistency of mayo taken straight from the jar. You gotta thin it out, guys.
4. I could not detect any crispy onion bits.

Even so, on the whole, the burger worked. Somehow.

Would not not recommend.