I would respectfully disagree. Being invisible to darkvision is a HUGE tactical advantage--so big in fact, I've know DMs who consider it overpowered. This is especially true when you consider how many powers depend on being able to see the target. As far as being surprised, if you can get your hands on a weapon of warning (an uncommon magic item) that negates the chance of being surprised and makes it highly likely you'll win initiative rolls (what with having advantage on the roll and adding your Wis modifier to the roll). As long as the target can't see you, you have advantage on attack rolls. In my experience, it's almost always best to go with a ranged ranger, so you can stand 90 feet away from your target (assuming you chose a race with darkvision starting at 60 feet) and launch arrows with advantage on every attack roll.
If you take a level of rogue, you can gain experience in Stealth, making it even harder for the enemy to detect you. If you take 3 levels of rogue and choose the assassin subclass, all your attacks in the first round (assuming you win initiative) are critical hits. That's probably a 10th level character, but that sounds about right if you're fighting vampires & demons.