I get the folks who feel that Melvins have been a bit a "samey" lately
It seems like I've heard this about every album since Nude With Boots. Do people think this album sounds like that one? I don't get it personally.

I've only had the chance to listen to this one a few times but I really like it so far and it doesn't really remind me of previous efforts. The album feels like it's more about chilling out to the atmosphere with the occasional fast hard rocker thrown in. If anything the vibe kind of reminds me of Honky although the two albums sound very different.
I suppose it can feel a little disjointed but I guess that's inevitable with 6 different bassists going for different styles. In the future I'd probably prefer full albums with each bassist instead of a "compilation" album.
I've never really understood why people say pretentiousness in bands is a negative trait. I don't think it matters either way if a band takes what they do seriously and delve deeper into it. For me it's all about the outcome at the end, not how the musician's themselves relate to or communicate their craft.
Well by definition pretentious means, "attempting to impress by affecting greater importance, talent, culture, etc.,
than is actually possessed." The average Joe at your local coffee house who is trying way too hard to impress girls by playing songs that sound like Oasis, closing his eyes when he doesn't really feel anything, and is a bit of a douche is pretentious. The average writer for Pitchfork media is pretentious.
Some people have called Tool pretentious and I never understood that. They've always had a lot of humor in their songs and I don't think someone who puts the lyrics, "I sold out long before you ever heard my name." is pretentious. It's a bit subjective determining what is and isn't though.