I personally didnt know much about Martian Manhunter when he was alive prior to Final Crisis #1 (in which he died, which Im presuming you knew, cos otherwise you wouldnt need to read this) but I was still very touched by the sadness this issue put across to the reader.
The last few panels were the real hardhitters which get the ol' water-works flowing and have you bubbling like a baby. Really really well written, emotional stuff!
GREAT ARTWORK TOO!
Well worth reading if you're reading Final Crisis!!
And if not, but you have any fondness for this character then pick it up anyway!
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