I think it's a good adventure movie, but not necessarily a good Indiana Jones movie, if that makes sense.
I will say - it wasn't as light-hearted as some of the other Indy films. It had moments, sure - but it was sitting right on the edge of taking itself "too seriously".
These echo my strongest sentiments after seeing the film today. It is a fine film but just as I feared, it really does feel like a big course correction from Kingdom of the Crystal Skull but because of that it just doesn't really feel like an Indy movie. Harrison Ford is, without a doubt, putting on one of the best performances of the series and it really does shine through how much he loves this character. It's supremely unfortunate the rest of the film does not rise to the occasion with him.
I would heartily argue that all four of the first Indy films feel like a cohesive set, parts of the same saga about the same character's adventure. Dial of Destiny, for better or worse, just feels like a modern action/adventure film with the character slid in. The biggest culprit to that has to be the action scenes. They are technically well done and exciting but they just do not gel with the franchise. Spielberg's style and the foundations of the series are on well thought out, well executed, easy to follow action sequences. Dial ratchets up the intensity and hurls Indy into the modern day film-making style of fast paced, quick cuts one after the other. Mangold doesn't do a bad job, it's just not Spielberg and not Indy.
I also figured going in that it would look like most of modern action fare and it does. The color pallet is bathed in either dark blue or bright orange, as most of cinema is now. Again, it's not bad on its own merit but it is visually the least vibrant and compelling Indy film. Even Temple of Doom, both the most thematic and visually dark entry is more vibrant than Dial with its splashes of bright reds and onyx.
I don't dislike the idea of using the Indy character to tell a tale of becoming past your prime or out of place with the ever changing world and the way those themes are explored in Dial are executed pretty well, I just have to ask if they needed to be explored with this character. It's very weird to me that both the fourth and fifth entries of this franchise act as closures for the characters. Even weirder that the much maligned Kingdom of the Crystal Skull that came out 15 years ago does it better, IMO. For all the talk of Crystal Skull or Temple of Doom being the black sheep of the franchise, I find it hard not to say that distinction falls to Dial. Not a bad film by any means, it's just not Indiana Jones at its core.
Also, I'm sure I'll be in the big minority here but:
Killing Mutt off screen really doesn't sit well with me. It's whatever with regards to whether Shia would actually be wanted back or want to be back himself (he puts way too much blame on himself for Crystal Skull when he's actually really damn good in it) but using him so brutally in Dial feels very mean spirited. Like it was some sort of 'hey, guys, we hear you, we hated that guy trying to steal Indy's spotlight too!' That's probably my cynicism more than anything substantial but just need to get it off my chest.