Anyone that loves the megaman series will have no problem with this new addition.
With every new system, there's a new megaman (except for the PS to PS2 leap). For the Nintendo DS we have Megaman ZX, a cool game that's just as fun as any other megaman game and won't dissapoint megaman veterans.
Megaman ZX is somewhat based off of Megaman Zero. The gameplay between them are somewhat similar except for a couple of differences. You don't collect weapons, but you do beat bosses and collect different forms entirely. New armour sets, and while they don't increase your defense they are whole different ways to play the game. You have ZX, who is loosely based off of Zero in megaman zero, and then you have the guardians in Megaman Zero, and get to play as them in different armour. HX has hovering and supreme dashing abilities, FX is extremely easy to just pummel opponents with the only weapon being energy blasts that do 2x more damage then normal pellets. However, there is a buster edit, which allows you to change the direction of your blasts depending on how much energy you have in FX. PX is a rapid fire machine that's more or less like a Ninja. PX has abilities that allow you to dash past enemies and be protected, however with poor attacking abilities and a flawed jump attack he isn't useful for practically anything, especially boss battles. Finally, you have LX, who is just a better swimmer and by all means much, much more useful in water then any form, but not so much on land. There are 8 bosses, with 3 main mini-bosses and a final boss with 4 forms. However, there is also a mission based mode and a full blown world map. The world map, when thinking of all the residential areas and boss areas, is pretty big.Some of the levels aren't very big, and even take a little over 10 minutes to do on any difficulty. The bosses are very original, however. The level design is top notch, especially in some specific areas. It's overall a good megaman game, with everything you'd really want.
There are sub-quests thrown into with the main missions. Really most of the sub-quests are stupid jobs that aren't much fun and don't add to the game. Even with that, some of them give you upgrades while others give you EC (currency of the game, and only used to upgrade energy) only. In all modes, this is useless. In easy and medium modes it's very easy to pay every last bit of EC to upgrade energy, while in hard mode it doesn't mean a thing. Like I said before, you can buy more energy for your other models if you hadn't gotten a level 4 victory on bosses. You can also spend money on arcade games, but they won't really be much and really just add a little bit to stretch out the game.
The graphics for the game aren't mind blowing. They're simple sprites. The animations look good, and by no means really make the game bad, but it's nothing you'll notice in the long run. Everything runs smoothly, and there is never any lag time. The backrounds are nice, and really there is every bit of detail you can think of.
The sound is somewhat like the graphics. The tunes are all enjoyable and match the stages very well. There is an explosion, hop, and little sounds that make the game more realistic. Nothing was left out, but it's nothing that makes the game stand out more, and it doesn't make it worse.
This game can stretch up to a very long time. At normal DS game pricing and over 20 hours easily with replayable value. Because of the world map style, you can spend a lot of time figuring out where sub-tanks, life-ups, and sub quests are. It's definately worth it, especially since some megaman games only go up to 5 hours on the first play for 50 dollar pricing.
Overall, megaman ZX won't dissapoint, and is a fine addition to the megaman universe. It's reccomendable to anyone really, and in the end is a fine and fun game. When the sequel inevitabely comes out, i'll be looking foward to it.