I actually quite enjoy both tutorial arcs and have played them multiple times--on characters where going through the phases as a starting hero/villain make sense.
On the other hand, there are other things to run outside of the Twinshot/Dr. Graves tutorial arcs if you're tired of them or they don't make sense for your character. There's a lot of content that frankly doesn't really make sense for some of my characters to do, but with a bit of imagination I do my best to rewrite in my head--or just end up dropping the contact and picking up a new one. There's so much content in this game that I swear I'm still running into contacts and arcs I never played on Live. It was and still is one of the best thing about City of Heroes/Villains: it's so established that there's so much content to make it easy to drop an arc you're not enjoying and pick up another.
Ultimately, I don't know why people are bashing Twinshot and Dr. Graves. Just...don't run those arcs? They're not for you at this point.