Oh Castlevania III! I have a love hate relationship with it. I love the game, but I don't think ANY game has ever made me rage more in my life. I've...... never even come close to beating it..... How do I put this.... It's hard for me to beat the clock tower stage where you get Grant, I can spend all day on that. It's, in my opinion, not as good as CV1, but that's probably mostly because of nostalgia, as I never played CV3 until recently, and have been playing CV1 most my life. It is better than CV2 though. I don't hate CV2, but it's a bad game. It is an NES game though, so I can't critique it too much.
As for CV4..... I don't know what it is, but I find it boring. all the freedom you get, with the whipping in all directions, and controlling your jumps, it just makes the game a bit too easy, so I usually get bored at around stage 4-2 or so. I mean, in Castlevania 1, I can play for like 6 hours straight, get any amount of game overs, and keep going, but with this one, I make it to stage 4 or so, have gotten only about 5-6 game overs, and I just turn it off because I'm bored. Maybe I'm missing something? The musics awesome, and it's fun at first, but... it just gets boring. But that's just my opinion, you guys feel free to love the game.