Graham is nothing like Harvin. He's a former track guy that showed a knack for catching the deep ball in college. He's not a shifty runner, nor is he built for that. Then, last year, he dropped a lot of balls and was arguably the worst WR in the NFL. To be fair, his role was wasted under a QB like Fitz. Graham did show separation ability and was open often... although, you could use the Fitz argument there as well and suggest defenses didn't need to respect him.
Goodwin has potential to be a Harvin-like player. But, there's good reason he was drafted where he was. He's 5'8, and is very raw since he was primarily a track star most of his time at Texas. I like drafting the athlete philosophy, but it will require patience. I'm not expecting much from him next year.