I'm not particularly picky. As a reference, I did like the Star Wars prequel movies. I only watched the new trilogy because it was on Disney+. If there was a surcharge (like with Mulan for the firs few months it came out), I wouldn't have bothered. For me, when I get into a SS, my main criteria are...
--options for no ads, or ads must be very mild
Ads on Hulu and Paramount Plus suck

I will only return to them on their ad free plans
The only place I put up with ads is YouTube since they're only 15s, or skippable after 5s.
--Must be viewable through a web browser on a PC
Contrast that to Quibi which was only through their app. For the longest time, I thought ATV+ required Apple hardware to view. It was only when I got a trial of ATV+ that I went ahead and looked into this.
--HD or SD
I'm watching on a 1440p monitor, so I don't care about 4K. In fact, I'd like for it to NOT be forced on me since it'd be wasted.
--must have content I like
This can be highly subjective, as I've heard reasons for some ppl like one SS, but others legit hating the same one. Ofc., people like different genres, actors, themes, etc. I just go through their catalog online (annoyed that Hulu doesn't let you do this with their own unless you're already subscribed), and note if there's enough content for me to watch. If I run out, then I did month-to-month and will just cancel.
Speaking of which...
1- I was disappointed that a lot of stuff required additional $$ to rent, buy, or get through some other channel. I saw some of the Star Treks before they got migrated to Paramount Plus, some TV series. Some random movies (before they got yanked). I'm going to let this lapse when my annual sub runs out. I'm told I really should binge
The Expanse.
I'm also going to miss out on Prime shipping, but TBH, it's take it or leave it at this point. It's nice, but I suspect I won't miss it (not especially since I'll be paying $140 instead of $120 annually now). I don't use any of the other services included with this... discount on Whole Foods, Music, Photos, etc.
2- I like SW and Marvel, and will be rewewing this at some point. I grew up on their "golden age" films of the 90s and Pixar, so I'll be watching related movies here as well
3- I'm enjoying my trial thus far. I've seen CODA, Greyhound, See, Defending Jacob, Central Park, Ted Lasso, and Morning Show. Will get as much stuff in as possible. Do agree with others as you can get through all of their content you'd like in a fraction of the time vs. other SS (although for me, I may need 1 to 3 more months)
4- Look forward to getting back to Disenchanted, Stranger Things, but also Lost In Space.
5- I would've loved to do this, ad-free, on annual rate as this is the one SS that's robust enough for me to consider so! But they canned the annual rate option! Ironically enough, that got me to check out the other SS! There is much I'd like to see here with new TV series coming out (e.g. Bob's Burgers), but also their backlog (e.g. Archer). And Futurama is set to get a new season in 2023!