You're definitely not alone, loads of people feel that way. Including me, I suppose.
Personally, I kind of like LoK as a series in itself, and would probably enjoy it if I'd never seen Last Airbender, but since I HAVE seen the original series, LoK is a huge letdown and yes, I would even go so far as to say I hate it. It has its moments, but the new characters are nearly all terrible (there are very few who aren't either boring or annoying and any tolerable characters are side-characters who don't show up often enough) and I don't think it suits the modernish setting.
I am same with you. I love Avatar: The Last Airbender and I watch it until the last episode. I'm getting bored when I watch the first episode of The Legend of Korra and didn't watch it again. It wasn't much interesting like The Last Airbender did.
I love both shows and can't quite seem to understand why HATE Legend of Korra. Yes, it's different, people's expectations might had differed and, of course, people seem to always compare them both. LoK tells a completely new story, not in the same age as TLA. I don't think it's completely "fair" to hate on LoK, if it's being compared to TLA.
I personally feel like The Legend of Korra was a spinoff series. I mean Avatar The Last Airbender is the greatest tv show of all time. Then.......the LoK came and it was no where near as good as ATLA. When I first watched the LoK I couldn't get used to it. It was very bland. That's what I think anyway.