Venture is just some heroes combined in one and it's still bad.
Her underground is just Wrecking Ball's ability but you can only use it for 5 seconds and emerge dealing low damage. Her Drill is just a worse version of Pharah's rocket launcher, and even tho her dash is pretty useful for knowcking off players, it's sometimes really predictable and easy to avoid.
Her Ult deals some damage and sends players into the air, which is similar to Sigma's ultimate, but you also deal damage. Her ult has 4 shots, and each one deals about 200 damage (i don't really know since she came out like 2 days ago). This is 800 damage in total, but with a Tank and a Support hero it's pretty easy to counter, and you can just jump.