I was reluctant to get into the Pop!s since I dislike the more generic design, but I started "collecting" them when I found some Rudolph ones on clearance from Target and a Chernabog on the Disney store. The thing that bugged me about the line at first was the sameness between figures and, broadly speaking, most of the ones I've bought are an exception to that. Most of them have mouths and are more highly detailed.
Offhand, the few exceptions in my collection are things I found on clearance for dirt-cheap (some Runaways figures for $2 apiece, some MvC-ish set with Strider Hiryu), although in those cases I still liked the characters themselves and the price was just right. There are a lot of examples of characters I like where I haven't bought because I either really dislike the design or can't justify spending that much for something of that quality. (And, of course, there's the fact that they just make too much stuff.)
My Pop! collection is on the smaller side. iirc, I own fewer than 20 (or maybe 25) full-sized figures. Most of them are more monstrous-looking characters. (It includes *three* versions of Cthluhu -- standard, glow-in-the-dark, and the patina. I stand by that decision.)
Funko's *other* stuff I like better. I frequently wind up buying Mystery Minis for things I don't really care about because the blind-boxed feature is kinda neat and I like the designs. (In some cases it's also a matter that I think I know what I'm getting -- such as Molten Man from the Spidey set (figured it had to be him or Mysterio) or Gandalf and Gimli from the LotR set). I love the Hikari line, but it's more than I like paying for collectibles. I got a few of them on the cheap ($15-20 for something that was originally marked up to like $50 or $60; the line kinda imploded at that price), but it's mostly just colorways of Skeletor (Mystic Powers version, Havoc, and... I think one other one).
And I will mention that my brother once tried to give me a Logan Pop! as a gift. I didn't really want it.
I don't have the money for them anyway. Looks like the one I thought would be super rare due to it being a pre order only bonus for Fallout 4 isn't as expensive as I thought it would be. ---