There is a problem with Intuition. It'd behind Eagle Eye. This ability is of immense use to almost any build. I've been told a million times it's not, but my experience (I do have some) tells me that having it significantly lengthens my average game, and I mean before level three. (Level three actually shortens it a bit, because it tempts me into blowing up my stuff on The Wall and then I get pissed off and quit. :p) Knowing whether a lever will heal me or kill me, and better yet, knowing where the globes and shards are is already a very nice thing to have on a chaingun or AoMr run. On a shotgun or berserker run, it could completely save the game for me... except that I can't ever actually get it on either of those, because it's behind Eagle Eye, which means that getting it requires me to completely and totally waste two levels.
Now, I've suggested something similar before, and was resisted because having monster sense at level three would be overpowered. And it would! I am forced to agree with that. I think there's a pretty simple fix, though.
Get rid of it.
Think about it. Instead of the third level of Intuition, just take Cateye. Remember Cateye? That was a fun trait, right? But you haven't taken it in forever because you have Int3. Even worse, Int3 is not really all that much more useful. The basic reason it's overpowered is that it's like having Cat2 at the time you should have, at most, Cat1. Beyond that distance, is the information you get from Int3 really that important? It shows you where the monsters are in parts of the map where you cannot possibly attack them and do not yet need to worry about evading them. By the time you get to where they are, they will have moved, unless they're sitting on a lever. You seriously just might as well have taken Cateye and then you'd be able to actually hit the things instead of the barrel next to the red armor they're standing in front of.
I say we cap Intuition at 2 and make it a base trait. If there is some reason you have to have a certain number of things with prereqs, I say put TaN behind Ironman. They both do pretty much the same thing anyway, and I think Ironman is the more important one.