Force Choking Kenobi, who has a notoriously weak force shield...
Only dubbed so by the ignorant. He's in his own right an incredibly powerful Force user, and the fact that Dooku and Maul exclusively have demonstrated the ability to dismiss him with the Force on a consistent basis attests to their ability, not Kenobi's weakness.
collapsing a fighter over a ledge, not by pulling the fighter,
Clearly by pulling the freighter, dude. There's literally a few seconds of clip where it just drags several meters up to the cliff edge.
and sending some non force sensitives flying.
I wonder why this is so impressive when Mace and Vader do it, but not Maul.
That's not really enough to overcome Jaina,
Do inform me what she's done that's better.
and collapsing a tunnel is something Mara's done equally well. On Caedus's head, no less.
Not really. Mara collapsed portions of smaller tunnels, though she should logically be capable of similar feats, yes.
Regardless, teenage Maul being able to bring down sizeable buildings is better than anything Mara has demonstrated in that area.