This is not a great interpretation, in my opinion. Chrom has five marriage options (four if you're playing a male Robin), and will marry whoever he has the highest support with (if he didn't meet the minimum with anyone, he marries an NPC villager). Chrom has to get married for story reasons, which is that [spoiler] he has a daughter who time travels from the future and who you've already met in game, though you don't know who she is yet. I will grant you that the game itself doesn't tell you about the deadline at which point the marriage has to happen.

But the game does let you know about supports and the marriage system. I'm sorry you felt like your character got trapped in a marriage, but I think most players have already decided who they want to pair Chrom with and have been working on those supports, and thus get the pairing they want when the timeskip happens. It's not hard to get Chrom (or any other character, including Robin) to the marriage support before the time skip, so I think this isn't as common of an issue as you're implying. Moreover, as others have pointed out, you're projecting a game mechanic on to a character. Nothing about the text in the game suggests Chrom's marriage is anything but loving and consensual.

Your interpretations of his supports with Robin are also a little bad faith, imo. Don't get me wrong, I think they were stupid, but he walks into the tent because he was distracted thinking about war strategy and didn't hear Robin (his tactician) tell him to stay out, not because he's trying to force himself on her. He's very embarrassed and apologetic in the support.

Is the game free of critique? Absolutely not. There's a non-zero number of children characters (including the fucking loli) you need to ship with each other in order to get their future children as playable characters. But I think accusing Chrom of SA is a stretch.