This camp is very beautiful and has the feeling of a battlefield military camp. But because the model was modified from a field hospital, there are still many surgical tools and blood stains on the table.
From a content maker perspective, the Mercenary Camp building is a bit of a missed opportunity. A soldier’s camp site that looks the part would be extremely useful to scenario designers, not to mention one with ready-made mercenary recruiting functions. And AoE3 hadn’t had one 100% suited for the purpose.
However, a few factors have dragged down the Mercenary Camp’s potential:
It’s implemented as a tech upgrade to Tavern, without an independent protounit. From a dev perspective this is perfectly logical, but makes it harder to use.
The golden tents with Habsburg eagles are both excessively flamboyant & overly specific for wider use.
What the OP said: the surgical table inherited from Field Hospital sets a grim tone for the building, incongruent with its song and laughter SFX (since technically it’s still a Tavern).
I think all these can be improved on the cheap, with minimum hassle:
Make a Mercenary Camp protounit for scenario use, that’s functionally a copy of the default Tavern. The multiplayer version can still be a Tavern upgrade.
Lower the tent texture’s specularity (metallic gloss), replace the Habsburg eagle with less specific symbols that fit broader historical scenarios.
Replace the surgical table with thematically fitting props that already exist in the game, such as:
A campfire pit (numerous existing buildings);
A pot over the campfire (from native settlements);
The turkey table, guns, swords, chairs & stools, straight from the Tavern, which also serve to create a visual link between this and the Tavern:
Dishes & mugs from the Plymouth props, from which the turkey & chair originated.
Technically the game already had a Mercenary Camp building.
It is available in the editor and looks like a Barracks but it trains mercenaries like a Tavern.
This building should get reskinned and used instead of the Tavern for Germans.