Hi teck,
Welcome back to WW!
Yes, a lot has changed over the past few years.
I think that most genre specific groups are dying out as there needs to be a lot of activity in a specific genre to maintain them, so it seems to be more successful keeping a more general group going.
Exception to test this rule is the Children's Writers Group (
http://writewords.org.uk/groups/66.asp). Otherwise, I think, choosing by activity level is a good thing.
Fast First Draft is primarily a morale boosting "keep you writing" group, not a crit group.
Flash Fiction is very active, but is for... flash fiction... so a lot of fun, but short and not genre specific. Main activity there seems to be the weekly competitions (recommended, but take a lot of time). I can't comment on the poetry groups, but it doesn't sound like you need those either!
Intensive Critique (
http://writewords.org.uk/groups/146.asp) tends to be quite active and has, as its name suggests, lots of in-depth critique.
Then there are the short story groups - Commercial Short Story at least aims primarily at selling to magazines, but crits are in-depth and pretty good there too.
And, finally, once you've got a finished MSS, I am actively trying to drive up some activity in the Whole MS read-swapping group (
http://writewords.org.uk/groups/202.asp) which is aimed at giving bigger picture, reader-level feedback on larger chunks (up to 10,000 words with the potential for finding beta readers for the full if you are that way inclined).
And, if none of those grab you, you can always propose your own group here:
http://writewords.org.uk/groups/application.asp
Either way, hope you find what you're looking for!