It seems that for every post I read about someone's awesome project there are 5-6 people saying "Your idea sucks, why'd you waste your time"
Guys, do yourself a favor and don't post these comments. You're not sharing any profound insights, you're just compensating for some insecurity you have.
In OP's case, I don't especially think he cares whether you thought his idea was the next Google. I base this on the fact that: A.) The site is already mature and B.) title says "my side project for over a year" -- so like, 1 year later, your negative comment is going to change his mind? Yeah, I doubt it.
If you put a year of effort into a nice webapp like OPs, you will have users, and people will enjoy your service. Also, this site is very impressive, and makes a good portfolio piece for sure.
I don't know if anyone is maybe getting the wrong idea. Personally, I don't click Show HN and then pretend to be PG interviewing the guy for a seed round. I click Show HN's to see cool stuff.
If you like it, then try it, use it, whatever. But if you don't have anything constructive to say, then you're wasting everyone's time, including your own.
I get what some users mean when they criticize projects in this manner. They're saying, "You're so smart and this is all you came up with?" It's not so much an insult as it is disappointment of a talented person. Their mentality is "If I had your talent, I wouldn't have wasted my time on this."
But it's important to understand that the whole purpose of side projects is to take a journey, learn, experience, and try out random things. It's impossible to tell accurately weather a project succeeds or not so you have to try.
I'm sure if Sergey Brin and Larry Page submitted their Google prototype on HN it would have been met with "Why? There's already Yahoo, AOL, Microsoft, Lycos, Alta Vista... they do search and they're established, Page Rank is just a feature. What's stopping Lycos or Alta Vista from implimenting their own Page Rank algorithm?". Twitter would have been met with "Only 140 characters? That's not going to get anywhere". (all things that a VC would say)
I blame this on Hacker News (emphasis on HACKER) having more startup news than projects, inventions, designs, code samples, and hacking articles. The emphasis on success starts to drown out the emphasis on coding for fun even if you fail. Oddly enough in the Mixergy.com interview with Paul Graham. At exactly 49:40 Paul says, "[hacker news] was originally called startup news but after 6 months we changed it to hacker news cause we got sick of reading about nothing but startup stuff."