Death note turns shit about halfway through. There's no avoiding that. The ending's nice though. It seems to me that the reason you love death note so much is that you only have stuff like Naruto and Bleach to compare it to. Sure Death note is pretty good - the first half is superb - if you ask me - but there are lots of better anime out there.
I suggest you try yourself on something more mature, like Code Geass, Welcome to the NHK, or, if you're really in for an emotional experience, Clannad.
Edit: To clarify After Light gave up the death note to loose his memory of it, the series start declining. There is no suspense anymore; they are just faffing about, trying to deal with this corporation that got a hold of the death note. At that point I was forcing myself to read on, hoping it would return to its former greatness as soon as Light got the death note back, and for a while after he got it back, it did actually return to being the great series I had loved. However, as soon as L dies, the author does all this bullshit, and instead of progressing the story in a potentially interesting direction, he just returns it to the status quo, with poor substitutes for L.
My theory is this: Around the point where Light gave up the death note, the mangaka, began to loose interest in the series, and run out of ideas. If you ask me, the entire sequence where L is chained to Light is clearly written by an uninspired mangaka. My theory is further supported by the scenes after Light gets the death note back (for example, the scene in the helicopter, where he regains his memories). The mangaka had clearly planned, and scripted, these scenes before making Light give up the death note; while he was still inspired. To me these scenes are a bit like a time capsule: A window into the past, to a time where the writer was still in his prime; where he still liked the series.
Then, after this brief comeback, we take a five year leap, and return to the uninspired writing we are all too familiar with by now.
Tl;dr: The mangaka got bored with the series after Light gave up the death note. This is indicated by the sequence of events right after Light got the death note back: A sequence that it is natural to assume he had scripted before writing the part where L and Light were chained together; while he was still inspired.
I suggest you try yourself on something more mature, like Code Geass, Welcome to the NHK, or, if you're really in for an emotional experience, Clannad.
Edit: To clarify After Light gave up the death note to loose his memory of it, the series start declining. There is no suspense anymore; they are just faffing about, trying to deal with this corporation that got a hold of the death note. At that point I was forcing myself to read on, hoping it would return to its former greatness as soon as Light got the death note back, and for a while after he got it back, it did actually return to being the great series I had loved. However, as soon as L dies, the author does all this bullshit, and instead of progressing the story in a potentially interesting direction, he just returns it to the status quo, with poor substitutes for L.
My theory is this: Around the point where Light gave up the death note, the mangaka, began to loose interest in the series, and run out of ideas. If you ask me, the entire sequence where L is chained to Light is clearly written by an uninspired mangaka. My theory is further supported by the scenes after Light gets the death note back (for example, the scene in the helicopter, where he regains his memories). The mangaka had clearly planned, and scripted, these scenes before making Light give up the death note; while he was still inspired. To me these scenes are a bit like a time capsule: A window into the past, to a time where the writer was still in his prime; where he still liked the series.
Then, after this brief comeback, we take a five year leap, and return to the uninspired writing we are all too familiar with by now.
Tl;dr: The mangaka got bored with the series after Light gave up the death note. This is indicated by the sequence of events right after Light got the death note back: A sequence that it is natural to assume he had scripted before writing the part where L and Light were chained together; while he was still inspired.