Let's also not forget that Houston is a top defense as well. Last weeks debacle likely was a hiccup. I'm not saying this means the Bengals are good offense, but Houston has been known to do make even great defenses look bad. I think the jury is still out. Even if we can call the Bengal bad, the Ravens D ended up doing what they should to bad offenses. And that may be what we face week 2. It might take until week 3 or 4 to get a definitive on that.
They didn't make Blake Bortles look very bad. I think the Ravens defense is very good but Houston's D shouldn't be the litmus test, especially one that was without both of their starting CBs during parts of the game last night.
In regards to whether the Ravens are that good or the Bengals that bad, here's a video that really breaks down the Ravens defense vs the Bengals offense and the answer seems to be......both.