Like it or not I gave three good examples, where she fairs more or less as good as Luke and that's excluding example with Caedus. That's consistent enough. Obviously she is not as powerful as Luke, hence she doesn't have good TK feats but that doesn't make her any less lethal in combat.
I also completely disagree with Mara being in Luke's league. I think Mara can outclass Luke in any type of espionage or other spy work, but in battle there is a drastic difference.
I view Mara's combat peers as being people like Kyle Katarn, Kyp Durron, Corran Horn, Saba Sebatyne, and many other Masters that I would place into the 2nd highest tier of Jedi, with the top tier consisting of the likes of Yoda, Luke, Mace, etc.
Refrencing your post involving Nyax: if that elevates Mara to Luke's level, does it also elevate Tahiri to Luke's level? Nyax outclassed all 3 of them.
__________________ "You must begin by gaining power over yourself; then another; then a group, an order, a world, a species, a group of species... finally, the galaxy itself."
- Darth Plagueis
"She may be small but she packs a punch and when shes in this mood...she goes for my danglers" - Oghren, Dragon Age
It's all really opinion based. You put Luke, Mace and Yoda in the same league. Yet, we know that Mace is not as powerful as Yoda. And both Mace and Yoda are not as powerful as Luke. Easiest way to put Yoda and Windu in the same league is by comparing performance against Sidious. I did the same thing by comparing Luke's and Mara's performance against Nyax, Lumiya and Caedus.
Putting Mara in the same league with Kyle Katarn and Kyp Durron is plain wrong. Darkside Kyle on darkside nexus was unable to defeat Mara in combat. Caedus had no problem fighting Kyle with three other Jedi, while barely survived Mara alone.
Kyp Durron at best is on level with Kyle, or at least that's how Luke evaluated him in FotJ. And we know that Kyp is nowhere as good as Luke based on performance against Slayers.
As of Tahiri Veila, good point but, yes, that shows that she is a powerful Jedi too.
Years later she demonstrated quiet a few good feats. Like forming Force shield to block turbolaser bombardment like Caedus. When Abeloth tried to mind dominate her, she was able to resist. When Abeloth threw a head that exploded with dark energy, Tahiri blocked it with a Force barrier too.
While Tahiri was young, when she fought Nyax, she already had years of experience gained from Yuuzhan Vong war. Unlike normal wars, it was physical combat oriented, where she had to heavily rely on lightsaber combat skills. It makes sense that she reached her potential earlier than other Force users normally do. At one point she even survived huge explosion by forming Force barrier around her and that was before fight with Nyax, a weak Jedi would not be able to accomplish such impressive feat.