I started playing BioShock on it because a) never played it and apparently was a short game and b) because it's one of the largest titles and will free that space once I finish it. The LCD is a bit distracting because I play at night and the bright grayish blacks is a bit distracting (plus there are a few graphical glitches occurring every 2 or 3 minutes lasting one frame). Controls are fine, playing in handheld mode only, battery is fine I gues, yesterday I played from 11 PM to 2 AM with battery going from 88% to 15%. Loading times are short, should try it on my Switch 1 to compare them really but too lazy I guess. Main gripe is storage size, 256+256 while I had a 1tb card in the other, so most games aren't still downloaded due lack of room. In fact I had to use the virtual card system to move games back to the oled after the transfer so that they aren't downloaded in the Switch 2 (many small indie games like Slay the Spire, plus games I don't think require the extra power from the Switch 2). And it's heavy but since I'm adult I can handle it.
Haven't played any S2 games yet, but bought DKB, Cyberpunk and MKW. Not into game key cards but my perception about them changed, right now I think I prefer digital only rather than key card because people around me wouldn't buy it, however digitals down here have a 21% tax so some digital games are more expensive than even new physical games.
Also I think the S2 will raise its price by the end of the year / beginning of next year so I preferred to buy it now than waiting for a discount. So, overall I'm more happy than not. Test will be playing one of the big Zeldas or one of the S2 games, though.