"Safe but slow" would be a more accurate rating, yes. :P I wavered on FF because it's pretty amazing on masterminds, but it really shines in groups. May be more of a "Pets/No" than a "No". Thanks for the feedback. :)
Thanks for the feedback! Temporal Selection looks like the same kind of "this is a very worthwhile power" as Forge/Painbringer/Fortitude/Speed Boost(/etc) to me, powers that aren't the reason why a set is good and you might skip them if making a solo-exclusive build but which ought to be considered must-haves otherwise. With that being an overestimate, it should get a "Friendly" rating instead since unlike Thermal/Pain/Empathy/Kinetics there aren't other ally-only powers in Time.
I never doubted its soloing potential, though, but with several PBAoE buffs it's blatantly more effective with some targets for them.
Thanks for the feedback! Some of this falls in the "it's an overview, not a detailed guide" pit of not giving enough details, but some of the rest:
(First) The tiering is definitely arguable. I stand by it, but I don't intend to say that Trick Arrow is useless (it's not!), and Poison and Storm Summoning are actually among my favorites - but grading sets collectively on a mix of broadly applicable usefulness + ease of use + overall popularity, I'd put them low.
(Second) The "number of skills that require a friendly target" thing is a great idea, thanks! As is, it's a pretty vague summary based primarily on whether or not the powerful skills in the set require an ally or not, leaving some less powerful skills out of the consideration. It's accordingly rife with bias, and listing skill numbers would be either a better way of doing it or a very good supplement (I'll try to edit it in later). And as detailed above, I have almost certainly misjudged Time. My bad. :(
(Third) You're right - the "No" rating for soloing might give the wrong impression, and maybe just writing the "Meh" in the list would be better to avoid that (another likely edit). All support sets can solo, but those 3(/4) sets are sets I would assume a newcomer (especially to the game as a whole, but also especially to support sets) would have a bumpy ride with solo because their non-party powers are few and/or late in the set.