Min/Max Boards

I think it boils down to something pretty simple.

3.5 - Tons of tactically interesting choices at every level. Depending on what you play, you can also get choices every time you play a session. (What spells do I prep, which monster do I summon)
4e - Way less choices. All of them are uninteresting. +1 to hit, 2W Damage and slide 1, or 3w damage and push 1. You only get choices when you level.

With online boards, you have people constantly theorycrafting builds and running through various combos and very quickly the "Correct" 4e builds were flushed out. Conversation didn't immediately end because WoTC would throw out some errata that changed stuff, and that might revive it for a few weeks. Optimization basically became "Play one of the top tier builds, which are all some variant of ____". If your group doesn't optimize much it was "Play a tier 2 build, A, B, or C is good". If you don't want to optimize, why would you go online to discuss your build? Go somewhere edition neutral and talk about his story or plot elements.

4e isn't fun to talk about, so no one does. I suspect once 5e is out, there will be a strong 3.5 community, a weak 2nd ed community and a respectable 5e community (but based on what I've seen, I don't see it being better than 3.X, and so I don't see much migration)

Battle hardened:  "he is immune to fear caused by overwhelming odds, overpowered opponents, and hopelessness." What determines these things? Generally there is not a fear check for them unless you are using other house rules? Just give immunity to fear and it probbaly wouldn't be too bad.

Scary good: A gladiator is immune to fear, but is good at scaring other people? I gather that gladiators generally fight one another in battles. Just sort of awkward because I guess this never comes up? Also mechanically awkward, make one check to then make a second with a bonus? How about just let them make weapon drill checks to intimidate as per the intimidate skill. IIRC thats already what the skill can do/does. If so, give a bonus for weapon drill checks to intimidate.

Stage presence: "These temp HP go away when the crowd disperses or the fighting has stopped." I'd add something like that on the end.

Signature move: Not generally as good as a normal full attack. What if its "make a weapon drill check DC X. Do ___". Maybe extra damage like knowledge devotion?

Crowd pleaser: 25% or less. Actually to make the class decently powerful, you can make it "opposed weapon drill check as a move action. If successful, auto kill." or something. (Dropping the 25% which requires the PC to track enemy HP.) (If you wanted you can keep the X/day requirement, but I'd make it more than 1)

Like a dog: I'd say this stacks/improves a monks unarmed strike.

Fall on the blade: At the end of your turn, choose an opponent. Until the end of your next turn, all attacks they make against you are critical hits. All melee attacks you make against them are also considered critical hits. These criticals do still need to be confirmed. (or do they?) - Rewrite of the ability.

Not human: Awkward considering other gladiators are immune to this.
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For Crowd stuff, I'd impliment some sort of alternate rules for "arena fights". You get a favor score with a crowd. +1 per gladiator level, +2 per crit this fight, +5 for each kill, +1 for unarmed, -1 for running away, +1 for unarmored, -2 for each hide check, +1 for exotic weapon, etc. Then say you can use these points for stuff. Maybe spend a ____ action to use special arena powers. "Gladiator Krusk has them in a frenzy, he signals and the crowd demands the lions be unleashed" or "The crowd hates Krusk for his cowadice, fatbeard74 lets out a cry of frustration at being unable to find him and someone in the crowd casts a light spell on Krusk. He is revealed feigning unconsciousness among the dead."

Maybe you make a skill check with +X, X being your score or maybe you have a pool of X, and can reduce it by those numbers.

Cant give very accurate feedback without a target tier, can you help us out?

As for wizards, spells arent class features either. The wizard should totally have class features. There is a reason people like dread necro, beguiller, and duskblade. Problem is that as soon as you start a buff the wizard thread people laugh. (rightly so). Really the spells need to be toned down, and the class needs  features.

Actual feedback. I dont like the nullify opponents feats feature.  Is really awkward, and you basically have to have the dm show you the foe stat block. (also should include non fighter feats, or it still sucks vs casters)

That username is familiar. Can't really recall where from, but I feel like we maybe chatted about stuff once or twice? Either way, see you around.