At their core, the Spyro games are very rudimentary collectathon platformers, but that's not necessarily always to their detriment.

I found these to be rather enjoyable games to sit back and relax to, and I think the simple nature of these games makes them accessible to most types of people.

The visuals are gorgeous, and both the environments and characters are lovingly recreated in bright, warm and colourful tones with a clean, polished look.
The music is enjoyable, upbeat and bouncy with groovy basslines and meandering noodly melodies at times.
What's nice is that the music itself was recreated for the remakes and it gives you the option to listen to the original tracks from the PS1 games or the new arrangements.

Spyro 2/3 build upon the simple formula a little bit by introducing side quests and different playable characters respectively which adds more variety and things for you to do.

The trilogy played a large role in influencing future platformers, and while by today's standards they're simple in nature, they're all still really good enjoyable games that stand well on their own in many aspects.