100% they may be better (or worse) in real life. Also think it's hard to judge if there is any chemistry or spark without meeting in person
I used OLD on & off for 4 years. Enjoyable and fun but can also be dis-heartening and you need to have a thick skin at times (ghosting etc).
Probably an average of 1 first date every 2 weeks or so.
There were people I matched with, got excited and then the date was nice but a bit of an anti climax. Usually they looked like there pics and despite me finding them attractive in a theoretical way, there was no spark.
Similarly I dated a couple of people for a few months each after not initially being blown away from their profile. There was just "something" there irl that I hadn't felt online.
The main example id use of how it can be completely different irl:
I had seen my now DPs profile quite a few times over the years on different dating apps. I thought he was very good looking but a bit vain and "stuck up" looking. Looked like he loved himself and I also thought he was probably too good looking for me (even if I did fancy him which I didn't from his profile). Then this last time last year I bumped into him in IRL. Instantly recognised him and vice versa. There were literal fireworks from the beginning. He is very attractive but couldn't have been any different from my initial impression of him. Never laughed so much with anyone and he's really down to earth and chilled out.
I always say to single friends that it's weird as I'd never have swiped on his profile in my life but I'm so so glad we met.
In a way I thank OLD for it as he says if we hadn't seen each other on the apps we wouldn't have known each other was single and he says he wouldn't have walked up and struck up a random conversation if he didn't know!