Happened from Day 1 of National Express taking over, poor timetables, neglected stations and trains, the fllthy 322s, poor customer service, no investment, bargain basement spending on everything, sponsored announcements over the PA, plans to replace 360s with 321s, the Ipswich departure screens debacle (nothing summed up lack of wanting to spend more than that), lack of cleaning or roofs, terrible liveries, poor reliability, threadbare seats, the list goes on.
However whilst the first tenure of Greater Anglia was a welcome improvement over what went before them, this latest franchise is a marked decline so far that is still ongoing.
I'd rank them in my lifetime of commuting up until the last 18 months
1. First Great Eastern
2. Anglia Railways
3. Greater Anglia (original)
4. Greater Anglia (new)
<big gap>
5. WAGN (for the Prism days)
6. National Distress / One Failway.
Right now I'd move the current GA instance below the big gap and close (but just ahead of) to WAGN.