Harrison Ford allways plays Harrison Ford, and he is decent enough to pull it off so I'm not fussed. Tho its kinda sad to see cherished characters age that significantly. The movie should be very interesting extra bit just because Denis Villeneuve is directing. Like his style quite a bit, with Prisoners, Sicario and incendies (havent seen arrival yet).
Same would go for Anthony Hopkins or Samuel L. Jackson. Most of the time they don't act and their roles are quite similar (especially Jackson), but you can hardly replace them cause they do their job perfectly.
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