Okay, I'm going to keep this brief as not to spoil the movie....
On a scale of:
My review:
Lost is the charm of the earlier 1930's in the movie, as it takes place in the late 1950's now. Some of the characters are now gone and you're left with a now much older Indiana Jones carrying the baggage of his past the entire movie. Because it's Harrison Ford, you find yourself tolorating it, and you get past it as the plot "thickens" and the action scurries along. However, in my opinion, gone also was the really tough grinding, or revolutionary ways of finding artifacts and clues that made you sit up in your seat in the first three movies. There's clues and fact finding, but no real brainbusters, or boobie trapped fiasco that made the other movies rivetting and funny at times.
Indiana flirts with the past, has added a new 20 years of history behind where you left him, and where he is now, so be ready for a whole new background beyond his teaching years.
As for "CGI", I think George Lucas tried to keep it looking like the feel of the older Jones movies and I didn't feel it really distracted from the movie. If you "get it" that it's a George Lucas film, it won't bother you. Yes, if you're looking for cutting edge CGI, you might be a little slighted.
As for the conclusion, I'd offer that this is a series closer in that there are loose ends tied up, some in "cheesier" ways than others, and Lucas makes this Indiana Jones a "Lucas Film Medley" of sorts. You'll figure that out when you see it.
If you're a fan of the series, I'd recommend going to see it while you can in a theater. After all, it's a George Lucas film, and it goes out big. If you're just curious, Blu Ray will be out in 6-8 months.