My opinion is this: the name Jehovah is one of the hundreds of possible combinations for the Tetragrammaton. But even if it was the 'correct' one, Jesus opened up our view of God into what we now know as the Holy Trinity. Sticking to the Name so exclusively after Christ is basically heresy, as it implicitly (or explicitly in the case of JWs) denies the Trinitarian God by focusing solely on the Father. In any case, the Name was exclusively used (or not so much) by the Jews before Christ. It was never used by Christ or the apostles, despite what the JWs claim. Lastly, the obsession of JWs with using it in every second sentence, even if we leave aside the Trinity, is a gross violation of the Third Commandment.
That being said, I don't consider it a 'verboten' name. I sometimes still utter it in my prayers. I do however think it is misguided to focus exclusively on it.