I think I'm one of the few people that liked the Monkey thing. To me, it was right out of something you'd see in TOD. It was absurd, but at the same time I liked it.
The alien thing was ok to me, other than the last few minutes. I thought some of that was overdone.
But hey, it was still Indy to me, but is all its own in a way. I thought Harrison Ford was at his absolute best in this one. Really, he did an amazing job. Mutt was great and so was Oxley. Marion wasn't bad, but I wasn't that impressed. The Russians were a bit of a letdown though and Mac wasn't all that great.
Overall I think this was in league with TOD. Not Raiders or Last Crusade good of course, but by no means awful. I am absolutely pulling for 1-2 more of these.