Same here, the few times I've tried tinned pasta sauces I've ended up having to add a ton of my own ingredients to make it edible.
And of course you can vary it according to your mood for the evening.
if I'm doing a tomato based sauce I like to add tons of basil & oregano or marjoram if I've got no oregano. Rosemary is nice with tomato as well.
plus I'll add a bit of gravy powder (or if you're vegetarian then maize cornflour) to thicken it a bit.
Black pepper (fresh ground if possible) is good with tomato also.
after you've made a few you'll find your own preferences & you'll get a feel for what to add if you fancy something a bit more savoury, sweet or spicy.
Oh, one thing I found. A good quality dark soy sauce can add a real nice savoury touch to a pasta sauce if that's what you're fancying.
This can also be made with some frozen mixed veges in for a change in flavour (something with corn in is best)
Or (&) of course with mince (braise it after you've sauteed the onions & garlic)
Then, of course, there are the creamy, or cheese or fish based pasta sauces.
I don't tend to make them so often so you might get some better recipies from someone else but I have had some nice ones.
One I do like is very basic.
a finely sliced onion or two, lightly fried in butter/margarine
A tin of reduced cream or a ton of sour cream (again depending on your mood that night)
a pinch of salt (to taste),
a touch of mustard powder (dip in the tip of a sharp knife)
a heaped teaspoon or two (or three
) of paprika (again to taste).
I like it with sliced button mushrooms in, but is good without also.
This one goes very well on it's own or with strips ofchicken or beef (chuck them in when you're doing the onion).
A sprinkle of chives on top after cooking adds a bit of colour & a nice bite.
This is a very mild sauce.
Myself I tend to use sour cream & add a good shaking of vinegar when I make it.
It's also nice with a chicken oxo cube added
&/or whater herbs you prefer.
But again, it depends of the mood of the day