If you're a good player 'noob' weapons as you speak of should be easy to counter.
Well, except not really. Most of them don't even give you a chance. How is one to counter a stuffty weapon like the Direct Hit, or Loch n' Load, when you turn the corner and run into the demoman/soldier then get one-hit killed by a cheap weapon with ridiculous damage? The answer isn't to play a class with more health. Let's not even talk about crits, because no matter how good you are they'll allow some brainless moron to kill you because that's what they were intended for. To give the people who are bad at this game a chance. That's why they're terrible.
The Pomson is just throwing a Volkswagen down a corridor and whoever made it drain ubers and cloak was really brilliant, they knew exactly how to annoy people with a practically unavoidable weapon whose hitboxes are the same as the rocket launcher's. Then you have weapons that exist solely to make a class even easier for people to play, like the Bad Box and Training Wheel Launcher. Real, good soldiers don't need to rely on giving themselves health or faster rockets to actually function in the game, and those are the soldiers I'd rather pocket. When you can only load three out of four rockets, you're practically useless. Cow Mangler is just laughable. Everyone I've seen use it has been terribad at it.
The Soda Pooper is another example of a weapon that exists solely to make a class easier. It's like you're announcing to the world you wouldn't be able to kill anyone without relying on a constant supply of minicrits you get for doing absolutely nothing. And really, most of the people I've seen use it are too stupid to even put it away just before they reach full hype to save the stupid crits for when they need it. They just keep running. Force-A-Nature is fine now.
Heavy is just... heavy. I've not seen anyone use Natascha just because how laughably useless it is, and Bad Beast heavies are usually terrible players. Anyone who will give up the already low mobility the Heavy has just for a little bit of damage obviously isn't right in the head.
Demoknight is the all time worst. Why Valve added this mutilation of demoman, I'll never know. With a launcher that can two-hit kill a heavy, a shield with ridiculous damage resistance, the ability to earn instant crits after barely a second of charge, coupled with faster move speed and higher health per head... it's absolutely idiotic. When it's a stupid demoknight it's fine, because chances are he's going to miss those OP rooster n' Load pipes, so you can take him down easy. However, when he has a quarter of a brain he can just peek around corners and spam his pipes, then charge at you for about three inches, get an insta-crit (because they broke that) then walk off scott-free.
tl;dr tf_weapon_criticals 0
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