EGM gave Harmony of Dissonance a score of 9.5, 10, 9.5 with a Gold award.
"The perfect mix of action and exploration keeps you constantly coming back for more in hopes of opening up more the castle map and beefing up your character. It's so addictive that I couldn't put it down.
Boss Battles are way too easy, and the music took quite a hit from the incredible tunes of the last game. But on the whole, this is one superb game. If you're a fan of the Castlevania series (or side-scrollers in general) you would be doing yourself a great disservice by not picking up Harmony as soon as possible. It's one of the best GBA games so far."
"Circle of the Moon was a really good game, but Harmony of Dissonance is great. I haven't been this into a Castlevania since Symphony of the Night. That's saying a lot."
"Konami condensed everything that's so great about Symphony of the Night into a hand-held game"
Castlevania: Harmony of Dissonance on Wii U -
https://www.youtube.com/watch?v=smW_oZJ3RfY
Japanese GBA trailer -
https://youtu.be/zfbTtA94jPM
Gamespot interview with Igarashi -
http://www.gamespot.com/articles/tgs-2002-castlevania-qanda/1100-2880807/
HoD was the first followup to SoTN by staff from SoTN and from Bloodlines on Game Boy Advance hardware. It's like a lite version of SoTN focusing on the action and exploring the huge map of the castle, and you can move very quickly by dashing with L or R. The 8 bit style soundtrack is reminiscent of the NES games with a good amount of bass if played on the right GBA hardware, and was downgraded to the GBC chip to get the graphics closer to the quality of SoTN on Playstation. It follows up as a sequel storywise to Castlevania 2 and I like how the castle is in a weird, chaotic state, that's even worse than SoTN, because of the status of Dracula in the game's plot.
If you prefer the linear Castlevania games like Rondo of Blood or the NES games, Harmony of Dissonance is a good Metroidvania to play because it focuses on whip wielding Belmont with limited magical abilities fighting a lot of bosses and enemies over a huge castle that you can traverse very fast.
The boss rush mode has a nice bonus character if you use the Konami code before the title screen.
Circle of the Moon has really good level design and feels more Metroid-like than the IGAvanias with the layout of the castle and the way you acquire abilities and tons of breakable walls, and even has a section where you freeze enemies to reach an area. The music is great arranging older Castlevania themes, but the graphics and animation take a hit.
I didn't finish Aria of Sorrow (3rd GBA game), but that and Dawn of Sorrow (DS) come close to SoTN.
*edit: In the Castlevania Chronicles interview with IGA, he mentioned staff from SoTN and Rondo were working on the next Castlevania, that I assumed was HoD, but it looks like it was just the chief programmer who had "Special Thanks" in Rondo. The director and planner were both from Bloodlines though.