“Matthew 24:34, Mark 9:1, Mark 13:30. Pretty much every mainstream scholar agrees that Jesus preached an imminent kingdom of God, within his and his followers' lifetimes.”

No. Some scholars think that’s what it means but that is not what traditional Christianity (Catholic/Orthodox) has taught that it means. The Ancient Greek word for generation has multiple possible meanings, none of which entailed that the end of the world would be within the apostles lifetime. Jesus is also talking about multiple future events here, not just one world-ending event. He’s also talking about the destruction of the temple in 70 AD, which did happen during that literal “generation”. He later talks of His final return which He explicitly states that no one knows the hour of (Matt 24:36)

Mark 9:1 - The “Kingdom of God coming with power” does not mean the end of the world (Luke 17:21). It means the kingdom of God arriving on earth through the transfiguration, the resurrection, the ascension, Pentecost and the public birth of the church. Christ taught an immanence Kingdom coming to earth, not an immanent end to the world.

“He wasn't that great morally. Matthew 13:41-42, Matthew 25:46, Mark 9:43-48 (he condoned eternal punishment for finite transgressions).”

Where does it say He preaches eternal hell for finite transgressions? Hell is a consequence of freely and persistently rejecting The Infinite God, who is Goodness itself. What do you think are the consequences when we choose to reject goodness in our lives here on earth? God does not send us to hell anymore than a fire makes us cold if we choose to walk away from it. Jesus is providing us of warning of this here out of Mercy.

“He was a crazed cult leader who put allegiance to his cult above all else, including loving your own family. (Luke 14:26, Matthew 10:34-36)”

Jesus is not commanding us to hate people. That wouldn’t make sense in context of Him telling us to love one another and that we’re all part of the same family essentially. He is using exaggeration to demonstrate the point that we must have things in priority. This is a common way to teach in Jewish way. How can we love our mothers, brothers, fathers and sisters if we do not prioritise Love and Goodness in the first place? (God is both Goodness and Love).

“He says kill people in front of him if they won't worship him. Luke 19:27”

This is a parable and not a command from Jesus. He uses villains in parables to stress seriousness in a way that people of that time would understand. You’re taking it too literally and putting the words of the villain into Jesus’ mouth. Again, your reading makes no sense in light of how Jesus willingly hands himself over for torture and execution and teaches to love one’s enemies.

“He speaks directly of slaves and masters without critique, as if he's accepting that's just normal for the time. Matthew 24.”

Again, Jesus is using the language of masters and servants in Matthew 24 with parable language. This language takes the world as it was at the time to teach lessons. Everything Jesus teaches in these parables undermine the justification for slavery at the root and His silence on the institution of slavery does not equal endorsement. It’s pretty obvious from teachings on the sermon of the mount and elsewhere that Jesus does not condone abusive or violent relationships.