Trying to hit his limbs while he does his fireball zoning + limbs game is a battle you will loose as a Karin player. You are low health yourself and have to deal with fireballs as well as occational timed port ins in addition to limbs.
Ex uppercut either whiffs completly or does a single hit for 30 damage on limbs (just retested that in training mode). Dhalsim quick rises faster than you are back on the ground after your ex dp. All you accomplish is waste an ex meter for no damage and no positional advantage.
While V-reversal is a decent tool, you don't have it at your disposal more than once or twice per round. Because of that alone it is very limited in use and situational at best.
Furthermore people really overrate Karins buttons. Are they some of the better buttons in the game? Yes, they certainly are! She can't hang anywhere close to characters with
really good buttons though. Chun/Vega/Bison rule supreme and you can't hit any buttons in those matchups as Karin. You'll get destroyed if you do.
I got some other indicators this matchup is complete garbage as well: According to
the SF V stats page Dhalsim is Karins worst matchup by far, with Karin only having a 40% winrate against him. And to be perfectly honest, it feels even worse than that. I wouldn't be suprised if this tilts even more into Dhalsims favor as people start to learn their characters better.
