Omen is NOT a bad character - he’s as balanced as well as the rest of the cast.
I’ve enjoyed the ever-changing characters - it’s consistently given me new things to learn and try and is a reason for me to keep playing. Without the new changes that have so often happened, this game would have stagnated and become boring for me long ago… As a matter of fact, if nothing changed, we’d still only have 6 characters, and Sadira would still be unbalanced and the best character in the game, because you couldn’t break her air combos. You would still be able to do opener-ender combos and cash out damage, among other unbalanced things. You would be missing favorite KI characters from games past (Spinal, Fulgore, TJ, Maya, Riptor, Cinder, Kim, Tusk, and Gargos), great and unique new characters (Kan Ra, Aganos, Hisako, and ARIA), and intriguing guests or bonus characters (Omen, Shago, Rash, and Arbiter). We wouldn’t have recaptures, flip-outs, stagger opportunities, different color accessories, premium outfits, retro costumes, boosters, etc. The list goes on.
This game and its community is growing, and that’s a great thing. If you don’t like it or can’t see that, then well, to be blunt (and no offense, BTW), you simply don’t know what the heck you’re talking about. If having to “learn” how to play a game is frustrating to you, then maybe you should take a break for a bit before trying again, seek out advice from those that do understand it, or just move onto something else that fits your pace.