Dear Movie Bob,
I've seen every one of those movies, save for Expendables 2 (first was an abortion, didn't wants to see a 2nd abortion of the same baby).
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******SPOILERS!************:
To what happened during A Good Day to Die Hard: Kid McClain kills someone undercover, via Russian mob hit, to get close to known Russian bad-guy during trial to bust him out. Older McClain just went to Russia to get his son out of prison because he thought he was in trouble (didn't get memo it was CIA cover). Russian bad-guy was supposedly old partner to now-Russian political big shot, possibly running for Russian leader(not sure, confused on Russian politics), and is going to court to 'speak out' about him. Politics guy tries to kill Russian bad-guy in courthouse, but young McClain gets him out, older McClain gets in the way,...queue car chase. After chasing bad guys wreck car, good guys go to "safe house", where another CIA op and young McClain tell him deal is a file for bad-guy out of Russia (and daughter, now). Safe house compromised, explosions, shooting, escape, run to hotel under construction, to meet daughter and get key. Meet daughter of bad-guy, find that she's double crossing them (anyone with a brain saw this coming and figured she was the chick in the mask at the court house). More shooting, killing with a knife-gun (cool, by the way), and cowboy-boot bad guy escapes to queue the helicopter scene where it shoots building and McClains jump out of the window into a construction garbage shoot. Boring talk scene between McClains about childhood, giving up, give some plot information on file (which was about partnership between original Russian bad guy and politic guy in how they were stealing nuclear material from Chernobol and caused the meltdown). They head to Chernobol, bad guys already there and opening vault; political guy calls cowboy-boot guy and tells him to kill the daughter and father when they get file. Vault opens, find out it was filled with weapons grade plutonium, no file, and daughter double-crosses the people she was working with to then find that she was working for her father the whole time (a double-cross double-cross, with reverse criss cross twist...with me so far?). Apparently the whole thing about the file was a ruse to use the political guy to help the original Russian bad-guy escape with billions of euros worth of weapons grade plutonium; queue a hired masseuse strangling political guy. McClains show up, kill some guards, trap Russian bad-guy in vault as daughter comes back. Now there's a gun fight, a grenade explosion with gas leak for extra explosiony goodness, and for some random reason the father escapes to the roof...of all places. Young McClain chases to roof to have shootout there, old McClain jumps into the back of a moving helicopter to try to kill daughter there. Drives truck, chained to the helicopter, out of the back of it to make it spin everywhere while more shooting happens. Young McClain throws father off of roof, where he predictably lands into the tail of the helicopter and becomes a minced-meat pie. Daughter yells "Bastards! ... This is for papa" and flies helicopter into building to try to kill McClains. They jump into pool below and survive. Ending is them hugging with daughter-McClain at airport in US of A.
Overall, not a "BAD" movie, but still not as good as the last two.