The only jar sauce I would tolerate on pasta is red pesto (dont even like green pesto in a jar)
Best basic sauce for pasta is butter, with cheese, black pepper
Or chilli, garlic, spring onion just warmed in good, very good olive oil, poured over the pasta (and the best olive oil is Greek, dont tell the Italians)
Or if you want a tomatoey sauce, you slowly cook down over a long period of time a tin of toms and first have fried up onion/garlic/herbs etc etc.
Then you can add whatever you want to that.
You can blitz up well cooked broccoli, with cream or ricotta and parmesan etc
Theres loads of possibilities that dont come out of a jar, the problem I find with jar sauces is that they are very stewed in flavour.