This is often lambasted as one of the worst sitcoms of all time....it's definitely not that. I can think of many worse.
What it is though is very generic mid-70s comedy. Blakey is as he was in on the buses (and there's lots of references to this), there's German neighbours (cue much "war time" hilarity), they don't like the "foreign" food etc.
Oddly enough if you understand British politics in the mid 70s, there's some actually quite humerous comments about this, especially to do with strikes/3 day week (although now very dated).