I think the community could come up with better weapon ideas.
I have a set of Demoman unlocks I'm working on (not like the Polycount Packs, just 3 unlocks plus a hat) that I honestly think without a shred of narcissism would be excellent additions to the game. I even have some pretty neat (or at least okay) concept art for the modeling I want to do.
The big
However... is that making unlocks for the Stickybomb Launcher and Grenade Launcher that operate the same way, i.e. actually shoot explodables and reload, is far more difficult than making primaries and secondaries for other classes because of the goofy ways those models work. So, yeah, I probably won't be doing it after all.
By the way, I know that Valve makes the stats for weapons submitted through the contribution site. I also guess I should just call these "new weapons" instead of "unlocks" now that Valve has made it clear that they're not terribly interested in adding new achievements.
Anyway, on topic: I agree with Frozen's analysis of the Quick Fix and the Disciplinary Action, which are my two personal favorite weapons to come out in the Uber Update. They actually change the play styles of those classes in a noticeable, game changing way - the Medic radically so, the Soldier more subtly.
The Enforcer, the Family Business, the Eviction Notice, and the Liberty Launcher were totally phoned in (though I still use the Liberty Launcher because I still can't aim with the stock Rocket Launcher after three years).
Also, in case it wasn't clear by my aforementioned ideas for Demoman unlocks, I loathe the new direction the Demoman has gone, becoming a berserker class that is really only fun for the Demoknight himself, not for his team mates to play with or his opponents to play against.