Though there are sure concerns about Emilia Clarke taking the lead female role in Solo, considering that she seems cast for cynical reasons - being a Game of Thrones star rather than a talented actress - those worries are nothing compared to those for Han Solo himself, Alden Ehrenreich.
While the actor gave an entertaining performance in the Coen brothers' Hail, Caesar! back in 2016, word from the Solo set is that Lucasfilm hasn't been at all impressed with his turn as Han, and even hired an acting coach mid-production to try and tighten things up.
Considering how crucial it is for Ehrenreich to ably capture Harrison Ford's essence, it's reasonable to be concerned about him giving a forgettable or even legitimately bad performance that drags the rest of the film down. The little we've seen of him in the film's first trailer doesn't exactly inspire much confidence.
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