Well thanks for the note of confidence! I don't recall your name or maybe you played under a different one? If you want to game with me you can add me on Steam, my user name is the same as it is here. Glad to hear you want to improve as vampire and good on you for playing Sentinel, it's the toughest vamp to play well in my opinion. You are right about Nosgoth feeling unbalanced, but at low levels it's usually the vampire that feel overpowered and the humans that feel weaker because the humans have a much higher learning curve.
However at higher levels of play, you are right, the humans are much stronger than the vampires because of their ability to hit from range but even when the vampires are close the humans can still beat them because of high dps on top of their really strong CC. Generally speaking right now, vampires are overpowered at lower levels of player, humans are overpowered at higher levels of play. Against good human teams your best bet is 3 reavers and maybe 1 deceiver to beat them. Most high level humans choose hunter or scout, reaver and deceiver can get in there and disrupt them and have a better chance at getting away compared to Sentinel and Tyrant and the vampires have to attack together all at once or it's game over.
I personally think it's easier to play vampire, but now that I've played the game for a while I've gotten much better at playing human and I've noticed that the vampires really do have a disadvantage against human players that know how to shoot. I've not been recording in a while, I'm having some hardware issues where recording my games are causing me to lag really badly but I think I've found a way to fix it. As for Tyrant, it's really good against low to mid level players, but against higher level players it just doesn't work, though Tyrant stacking can be really annoying, it's pretty easy to get around with alchemists, prophet, and a hunter. Tyrant is actually my favorite class but I've been making a conscious effort to get good with every class in the game, lately I've been playing a lot of sentinel and scout though but I can say that I am at least decent with every class in the game so far.