I'd much rather pick one thing I like from a list of ten than make ten binary decisions about ingredients.
However, the ten choices we get will never include the ten I want, or the ten you want - they will be what get offered by the Gnome dev team this release, and once we have got used to them, a completely different ten.
Granted being able to choose (unlike in Unity) is good, and if the options exist, someone will want every possible combination. (2^10 is only 1024 combinations, and you gotta hope more than 1 million people will use your GUI).
Best bet is to have both an easy way to pick a "skin" from popular choices (with a high contrast default that works regardless of LCD, CRT, or whatever is next, no matter how ugly - not that ugly should be the design objective) and a more complex "fix the feature that bugs you" - clearly marked "advanced users only" and with a way to save your choices and export them to other machines (by email?).
The worst possible is to pretend your desktop is a 2011 smartphone. Hell, I want Gnome-fallback-shell on my Samsung Note 4. Dropdown menus worked on 320x240 (as well as anything could on a Crap Graphic Array).
I definitely want to have multiple desktops, resizeable windows, and hierarchical menus on my Android phone. Icons are all very well for ten choices, but a complete failure for 1024 choices.
Hierarchically structured words big enough to read no mattter how many there are, are way better than, tiny, meaningless pictures you can't recognise no matter how few.