Tab targeting gets hardly noticeable later on. I admit, combat is very slow at first due to a lack of combos. I think it was... around level 7 when I unlocked the first combo, but I don't remember. Also, your basic attack is AWFUL, which is why you don't usually use it. It's when you unlock the plethora of other abilities that combat starts to grow on you. And also, when it comes to mount stamina, I know it gets annoying. But, I reccomend that as soon as you can, capture Logrash. I think he's in the second area you go to, he's really good with a lot of HP and stamina. And don't forget you can easily switch between mounts if you hotkey them on your action bar- Just go into your Familiars panel, drag their icon onto the hotkey bar(You know, where all of your moves are) wherever you're most comfortable. You can do the same on the mount hotbar that appears when you ride them so you can also dismount easily. It's what I do. But if it's not your thing, I DEFINATELY understand. I can see why you might prefer TERA.(Also try to focus on that right click attack, it's really good.)