Not exactly. I had no problems with the car in Fallout 2. But I do have some with vehicles combined with the current gameplay. If it is slow, weak and cumbersome, there is really nothing to gain from it, it'd be more a worry than of any real help - and on the other hand, if it is the opposite (as I believe most of the current audience would prefer it to be) it's just another gimmick making the already small map even smaller, and a winbutton.
Hence I said it'd be a tricky task to get it right. And that I'd rather not have it in.
That's why I am trying to make them just right, to not only be cumbersome and to not only be "Wow! Fallout racing!". Something inbetween. They'd be like traits with pros and cons. Fast but fragile. Slow but sturdy. Want to upgrade upgrade the health at the cost of speed? The speed at the cost of control?
Now, I admit being biased and a bit oneeyed with this issue, so perhaps you could give me some of the benefits of the slow and weak vehicle you described (other than it being a lootcontainer of limitless capacity on wheels, and "wow, I'm driving/pimping a car" -effect), so I could see the point.
As I said, all vehicles are faster than the top speed you can reach while running. It's a way to make it an attractive option to running. Less tiresome aswell, maybe in hardcoe, hunger and fatigue might be gained 100% slower while driving a vehicle.
This slow car, while lacking the high speed a more fragile car has, it is instead of a sturdy construction. Therefore it has more health, it is more resistant to impacts so you can roadkill some with it, it is better at off-roading (maybe it's 4x4) and it has a bigger storage space. I'd probably like that car the most, as I don't need the speed. I've got health, DT and a bigger inventory instead.
The faster cars, while not as fast as the light cars in racing games, are still pretty fast. They are probably the most enjoyable way to get from point A to B in a fast way without using fast travel (and if you've already went that way a few times by foot, which I assure you would have since cars would be obtainable later in the game). They are also good getaway cars, or if you chase down fleeing or unarmed enemies. But in a fight they are not fit, since they are fragile (not too high health or DT).
I am just trying to come up with cars that are effective at different areas and ineffective at others. Like traits.
I suggest that you try and think out a good way how vehicles would be implemented without just being a mean of fast travel. Even if you don't like it, because then you will try to focus more on the bad things and fix them. Like how you think it will either be cumbersome and more of a nuisance or it'll be too fast too furious. You will try to remove the racing aspects and the boring aspects, and find a middle part. That is what I try to do, I don't want racing in Fallout. I don't want it to be like what I've seen from Rage or Borderlands at all. It looks like crap to me.