The vast majority of ROMs screw up your phone.
Loads praise the latest ROM, maybe without ever using, until you read through the hundreds of comments and see small niggles like..........
No SMS, no working microphone, no Wifi.
Strangely, I've never had any problem with a phone 'as is'.
'Working like the Nexus 4'. Now what does that mean. I dread to think.
I agree that the vast majority of ROMs screw your phone up - manufacturers ROMs that is. When you consider how much better most phones run with modified stock ROMs it puts Samsung, HTC, Sony and LG to shame.