My overall thought is that it is a great addition to Cedar Point, a very fun coaster to ride, but one that will not get a lot of repeat rides from me unless the line is no more than 30 - 45 minutes... That is how I feel about TTD too, though I think I personally prefer Valravn a little more, since it's not a "one trick pony". The view from the top of Valravn is amazing, that first drop still feels unique and exciting (even with Maverick, TTD, and WT all having vertical, or beyond vertical drops), and the final inversion element offers serious hang time, especially in the back right! What I like even more than the coaster itself, however, is the impact the ride has on the area around it. It just brings that whole part of the park to life, and has turned one of the more awkward, dead-end parts of the park into a fun and exciting place to walk through, even if you don't NEED to! Really, my only complaint, or negative, would be the choice of yet more orange for the park. But that's mostly because I just don't personally care for the color, and also think a darker color scheme would have fit the ride's theme better as well. Minor quibbles though, and I think installing it was a great move by Cedar Point!
I agree with you that Valravn really made the Marina look a lot nicer. It was such a dead area in the park that really needed some love. I might go to Cedar Point this year and am looking forward to Valravn if I go. My only complaint with Valravn is its color scheme. I like the orangish/brownish track on blue supports but the thing is that Rougarou looks a lot like it with the orange and teak and it seems that they weren't too creative with Valravn's color. But I still think it's a great fit for Cedar Point! I feel like they made the right decision by putting in a B&M Dive Coaster and I hope they will be installed at the other Cedar Fair Parks.