I'm right after Usopp joined the crew! It's alright untill now, but I'm getting a bit bored.
When are they going to go to the grand line to find the one piece? *do not answer this*
in which episode does the anime begin to be really interesting? *answer this*
It's natural, the beginning of the anime isn't as exciting as the rest of the series, but fear not! It will get much more interesting!
I got hooked around on fifth arc (episodes 31-44 in the anime) and there I couldn't stop. By the time I reached the Grand Line (not telling you the episodes because you asked me not to

) I became addicted. By the time I got to Enies Lobby (much later on), it had become my favourite series/anime/manga of them all.
I liked the Kuro arc, which is where you are now, Usopp joining and stuff, but I was slow there (mainly because I was more focused on advancing Death Note by that time, and I'm still very far behind there!) and it was more of in standby... the arc that followed was where the action and the badass-ness of the anime started, just so damn epic! And the arc that followed, as I said, was what really got to me, and I became addicted.
Also, there's a mini-arc called Millenium Dragon arc (or something like that) before entering the Grand Line which is filler. They are just 5 or so episodes, and you may skip them without a problem (although you would miss a very funny scene in which Nami feeds Zoro xd) Just letting you know, if you want the number of episodes of those I can tell you. I skipped fillers and watched them all after catching up with the anime and manga. I needed more! xd