Don't get me wrong... Mario is a fantastic character, so don't go thinking I all out hate him when I start going into the sequel which a majority have played, or tested out: Super Mario Galaxy 2.
The Game World
This game gave me mixed feelings when I first started playing. Within the first few moments after the introduction sequence, I felt like I was going back to the very first level in Super Mario Galaxy. The sirens were going off now... not another crappy sequel where the levels look different, but carry the same principals of the predecessor to maintain some sort of consistency. Of course, the very first level is purely an introduction to the control scheme, so regarding the repetitive nature of the level becomes understandable. It is always nice to have a refresher on how everything works in the game before you really need to know what control scheme you should be using in certain situations. Thankfully, the controls are easy to learn, versatile, and responsive.
For the rest of the 'Universe' in SMG2, I felt the game was rushed, smaller in scope, and felt like a teaser extension of the original game. It always seems that in a game galaxy, there are limits. Seeing these limits feels as if any creative licence was choked completely out of the whole world design to create a greater, fuller set of landscapes to explore. With only a couple stars to collect per world, there is more filler background than actual platforming room to walk upon. This is my biggest letdown for the entire game. There could have been a lot more substance in these worlds, because I love exploration so much in Mario games.
Graphics
There is not too much to say or gripe about regarding the graphics. After all, we are talking about the Nintendo Wii here. For this game and console, the graphics are superb! The world doesn't look jagged, the texturing is smooth, and the water is as beautiful as it was before. I did however notice slowdown in one of the worlds where you had to jump across a series of platforms. Other than that one gripe, there isn't that less detailed look that usually carries with a sequel game. Very well done!
Gameplay
As I mentioned before, the overall game control was easy to use, and responsive. Both of those factors are a huge influence in the playability of the game, or any video game for any console for that matter.
World exploration is fluent, easily to manoeuvre, and sometimes laid out in the laziest of ways. Hand in hand with the shortness of the levels, there are a few 'Sling Stars' which you have to collect five pieces in order to advance. Sure, that is great... but where the heck is the challenge when all 5 of those pieces are practically right beside each other begin to be picked up!? I look forward to a least getting a little pissed off when I need to search out the pieces of that star. Where the heck did the challenge of searching for items go? Yet again I feel like SMG2 is an extension of the first game, not a separate entity.
There are a lot more power-ups in this game than that of the original, that is a plus. I won't fill you in on them if you do want to still rent this game or something. Most of them are short-lived, and you end up having to go back to get another power up in order to keep going. Good thing there are literally twenty or so in the level, so you really don;t have to backtrack to get another one.
Overall
Yes, I have mixed feelings about this game. It has its good points with the consistency of the graphics, ease of controls, and manoeuvrable worlds. What disappoints me the most, is the emptiness which cries out in this universe when there is only a couple of stars per level, the non-existent exploration of the galaxies in general, and how short the game feels by the time you get to the final battle with Bowser. To think with a sequel, it would be bigger, and even surpass the scope of the original. This whole game fell flat on its face in terms of the length, and lack of creative genius that radiated from the core of its ancestor. So much for a dramatic, epic exploration of a 'vast' galaxy. What a letdown...Nintendo could have pumped glory into this game, just enough to appreciate/celebrate the fact that this is the first sequel for a Nintendo Console game in the Mario department that is.
Try the game out if you do like Mario, but don't go thinking that this is going to break your vision of the original SMG game. After all, it is up to you what you enjoy the most. This is just my viewpoint, even if it is a little on negative side.