Saying that you don't think it's worth $30, and outlining why you have that opinion is not disrespectful, no. Calling out the price of $30 as a joke, with no substantive reasoning other than not liking it is certainly not constructive, and could be construed as disrespectful.
It's certainly ok to not want to spend $30 for this game, and I would never fault anyone for voicing that opinion.
I for one do think that it's worth that price. Is it a particularly groundbreaking game in terms of graphics or game mechanics? No. However, it is expanding a very sparsely populated genre of games, one that I find to be enjoyable. I find the story to be interesting, and I think it's simply fun to play. Is this game for everyone? No.
To be clear, I am not at all saying your post is disrespectful, nor do I think any less of you because you personally don't believe it is worth the money. That being said, I don't think the above comment about a different post being disrespectful was uncalled for.