(Sure, I wrote this for the Fantasy Craft boards, but it's long enough that it deserves a little cross-posting.)
While looking at build options recently, I was struck by the various "Expert" specialty traits, but it's hard to analyze them at a glance, given their dependence on supporting feats. Each of them, essentially, increases your feats taken for purposes of abilities that rely on the abilities of feats you have available. As such, here's a summary of the various ones available. Some are really good, some are good in a niche, and some aren't very useful at all. After writing up the list, I thought it would be interesting to share my findings. Most traits in Fantasy Craft are easy to parse and understand, but I thought these traits could use a bit of explanation as to what they do, precisely.
First off, Melee Combat Expert. This is only gained through the Fighter specialty, and treats you as if you have 2 more feats for purposes of any ability. Which abilities? Well, Melee Combat Expert is the best-supported Expert trait in the game, with benefits for a wide variety of builds, increasing trick usage and trick DCs. of course, there are a variety of chains that gain no benefit - axe, club, knife, whip, and any Melee feat chain from Adventure Companion.
- Feats that benefit: Fencing Mastery, Flail Supremacy, Greatsword Mastery, Hammer Mastery, Polearm Basics, Shield Supremacy, Spear Mastery, Spear Supremacy, Staff Mastery, Staff Supremacy, Sword Supremacy
- Tricks that benefit: Arrow Cutting, Breaking Twist*, Decisive Swing*, Parry, Shield Block, Triumphant Swing
The second Expert trait we see is Basic Combat Expert, only gained through the Vanguard specialty. This looks strong, right? There's a good deal of basic combat feats, and many of them are very, very good. The truth is, though, if you aren't using the tricks from Adventure Companion, only a single feat benefits. It's a strong feat, but it doesn't even have the decency to show up as the Vanguard's bonus feat. This might work well with the Captain's Right-Hand Man class ability, but it's not clear.
- Feat that benefits: Combat Focus
- Tricks that benefit: Damned If You Do*, Damned If You Don't*, Pick On the Big Guy*, Pick On the Little Guy*
The third Expert trait is Chance Expert, only found in the Cultist specialty (from Adventure Companion). Though the amount of feats that benefit from it is slim, its synergy with Fortunate is very strong, giving 2 extra d4 action dice. What's more, the specialty comes with a chance feat that directly benefits, making the Cultist a strong start for any chance-based build on par with the Adventurer. While not supported much, it is strong for a specialized Chance build.
- Feats that benefit: Black Cat, Fortunate, Fortune's Fool
- Tricks that benefit: None
Another Expert trait we get is Covert Expert, granted by the Raven Noble feat and the House Agent specialty (both from Adventure Companion), and a variation of it on the Hart Noble feat. It's really too bad that it's the most common and available Expert trait, because it's hardly supported at all! Better hope you plan to use poison, since it's the only trick that benefits out of the main book, though Adventure Companion does have an additional feat.
- Feat that benefits: Safe House*
- Tricks that benefit: Venom Master
Though not Unarmed Expert per se, the Tiger Noble feat (from Adventure Companion) grants a comparable ability. Unfortunately, most of its benefits are locked up at a pair of supremacy feats, so it may be considered even harder to utilize than Covert Expert. Adventure Companion gives a strong trick, but it's a trick shared by all combat styles (Melee Combat gets a comparable trick, listed above).
- Feats that benefit: Kicking Supremacy, Wrestling Supremacy
- Tricks that benefit: Decisive Blow*
* Trait found in Adventure Companion.
If I've missed something, let me know - it's quite possible my eyes glazed over when skimming through the feat lists. Hopefully the underutilized traits will see some additions at some point - it's clear why it's only a 1 point trait in the origin creation rules now that I look at it, but it feels like Melee Combat Expert should cost a good deal more than its counterparts.