The VLY has been in game for quite a while. This means that we don’t have speculate about whether it is OP or not based upon its stats and role bonuses, because we can look at what’s been happening in game. In fact, that’s exactly where we should be looking.
So, is the VLY OP? Well, I personally can’t answer that question. I rarely see them, and know jack ■■■■ about WH’s, where the VLY is apparently more common (some people use them to roll holes). There’s a group complaining about them in the following thread, but I’m also kind of skeptical of their competency. So, I’ll refrain from making any judgements based upon their comments alone.
Also, something to consider is that the VLY is a special edition ship with (afaik) no new sources. Thus, even if it is OP, the problem will naturally become less and less of an issue over time.