As much as I admire Serj and everything he's done in SOAD...I don't like how his vocals have changed over the years.
Self-titled: quirky, kinda cool, some METÖÖÖÖÖL moments.
Toxicity: FUCKING AWESOME!
Steal This Album: FUCKING AWESOME!
Mesmerize/Hypnotize: kinda cool...but not so metal anymore.
Current: singing through his god damn nose all the time! And the more heavy vocals are just about completely gone.
I loved SOAD when I saw them two years ago and thought everybody in the band was awesome...but in hindsight, I'm really not very fond of how he sings nowadays. I deeply respect a singer's ability to learn new things and new vocal styles, but why lose what you already have? It's his current voice that keeps me from getting excited about a possible new record.
Oh well, just about everything the band has put out ranges from good/great to awesome.