a sympathetic character IMO. That scene at the end of first episode feels more tragic now, since it's like he finally succeeded, created a being that wasn't hideous, didn't hate him or fear people. He got it right this time and he didn't neglect his "child" like he did after his first attempt, which made the emotional moment and the unexpected death more powerful.
If anything, that makes the Firstborn's anger pretty justified, since Victor abandoned him, only to try again. Such a cool direction to take the Frankenstein story