Wow....saw Regeneration and it wasn't bad. Wasn't great, but wasn't bad.
The biggest flaws have to be;
1. Phlox taking sooo long to assimilate. My gosh..the Borg should know his species from all the Federation ppl and tech they assimilated.
2. They left two Borg floating about in space. They shouldn't be dead...yet. And even if they are..the tech still works.
3. A major loose end with the Starfleet just forgetting all about the Borg. They could have had a few minutes showing Section 31 or someone hiding the knowledge.
4. The hand phasers should not be taking down so many Borg. Maybe one...but after dealing with 24th century Federation tech...22nd Tech should be easy.