What asteroids can produce gravity? (...)
Of course there is no gravity.
I totally agree, but also:
1. The GC asteroids dimension has gravity, that's why I believe some people would expect the same thing for GS asteroids. And yes, zero-gravity is realistic.
2. The GS jetpack is hard to control in zero gravity because it does not have horizontal control, but it only goes up and too fast. The current jet pack suits better in dimensions with normal gravity.
This is what I would do:
1. Keep the GS asteroids dimension with zero gravity (by the way, I like that).
2. Create a mean of mobility for zero-gravity which has smooth movement and can be controlled in any direction (A/S = move left-right, W/S = move towards or against the mouse pointer, Space/Z = up and down).
Example in this video. Perhaps as a kind of "wearable vehicle" like
Manned Maneuvering Unit, instead of an armor piece.
To sum up: If players have means to get good mobility in zero-gravity, the complaints about it will go away.