thanks for the great replies guys,
blackbrich, well no I didn't start completely from scratch, I learned some basics years before that. By intense learning I mean RTK1 (past 1500 now), Core2k, JLPT vocab deck, and Jpod101 every day for about 3-4 hours, on some days I learned as much as 7 or 8 hours.
When I say I understand nothing, I don't mean I don't understand a single word, but rather that I don't understand the gist of what's being said at all.
Vix86, that sounds like a reasonable estimate. I just wished I could learn faster, but that's how it is. It just takes time.
Core6k I'm doing already, but I'm only at 500 words in that particular deck because I focussed on Kanji so much up until now.
JKS87, well I suppose grammar is definitely one of the points. besides the obvious barrier of limited vocabulary this is also something I'll have to put more time into I guess. Even though I'd rather learn other things. Assimil sounds good I'll look into it, thanks.
ariariari, yeah that might be one problem. I'm starting to learn N4 vocab right now, but at this time I'm still at N5. However I've invested lots of time into Kanji that's not even yet required for N4, so I hope I can catch up with other things once I'm done with RTK.
Zarxrax, thanks yeah N4 grammar and core2k is what others said too. I've only done 500 of the latter. I understand most of those sentences though. Not sure what you mean when you say measuring progress in time means nothing. Of course saying "I learned for x years" doesn't matter much, IMO what matters is how much hours you have invested in learning the language during that. I'd say that having something like 2000 or 5000 hours under ones belt definitely means something if it was focussed study time.
fzort, absolutely I agree with you. the many conjugations of verbs definitely confused the hell out of me. So like I said to JKS87, grammar is certainly something I have to put more attention to.
yudantaiteki, 3 years...

I have to make haste.
Vempele, I guess reading vertically is the least of my problems even though it's interesting that you find reading horizontally much harder because you focussed so much on that.
sholum, thanks for mentioning what you did about manga with furigana. I'll keep it in mind. In fact, the one I have is probably not quite that easy, despite the fact that it has furigana. Don't know if you or anyone knows "Getsu Sei Ki". Also what you say about most series making use of the same vocabulary throughout is a good point.
As for your last comment, well yeah of course you could read anything if you just look up every word. However it's probably better to find something suitable for ones current level, because that kind of endlessly looking up words at every new page is tiresome.
jimeux, good point and I already tried Death Note (well I could understand 死神 because I had already seen the anime and recognized those Kanji lol). I suppose I'll focus on core2k and grammar for a few more months until I give my next manga a try, whilst hugging the dictionary.
ryuudou, thanks for seconding that. I hope you're right.
Tzadeck, thanks for your comment, I hope you're not right

I hope it won't take me that long to at least make it through the first manga and I understand a reasonable amount.