Bullet Bill = Noob item. I dont really care about them though they don't affect decent players who are far away from them.
Star = Okayish because again, they aren't likely to affect anyone who is doing well. And unlike the Bullet Bill, the star doesn't hold your hand.
Red shells = Fine. Because they can easily be defended against. Never usually is a time where I'm not holding a Banana or a Shell etc. Triple versions can break defences unless you have triple banana. But thankfully they introduced the Tanooki Tail for ultimate defence. So Triples are now fair sort of.
Green Shells = Perfect. Fair play, fair aim, fair everthing. You can also angle your shot to hit sides of characters so you can get past banana defence etc.
Bananas = Same as the Green Shell, Fair. Putting these on strategic places like ramps and between Thwomps (Snes Rainbow Road lol) is cool.
Chain Chomp = Basically the old bullet bill. But minorly different. Havent played DD in a while. can't remember weather its possible to hit the babies whilst using the chain chomp.
Blue Shell = I could write a massive long paragraph or an essay about why Blue Shells should be taken out of the game enitirely. But in short, I hate them. They void the game of all of its fairness and punish the players for doing well. I know you can dodge them but the chances of having a mushroom and being in first place is low. Why the hell they're on this list I dont know. Who the hell decided to put them in this game, I dont wanna know. How no one at Nintendo has yet decide to have an optione to AT LEAST turn them off, I have no idea. And they were on about looking to 'balance items' with Mario Kart 7... Great job.
Thankfully you can turn items off or certain items only but I still think you should be able to just fully customize it yourself. Turn of that stupid lightning bolt too...
BTW just to get things straight, I love the Mario Kart series as a whole, and friendly matches are fun, but when online or on grand Prix and some stupid unfair damn Blue Shell or Thunder-whilst-gliding BC happens it just gets annoying. I don't rage at the game because of Blue Shells, they just waste my time when having to start cups all over again (finally got 3 stars on all cups MK7, had to retry about a total of 7 times because of stuff like Blue Shells). Also hate how Blue Shells etc give noobs a false sense of victory. Reminds me of items in SSBB. Real victory equals fair items. What a long post. Well there's my say on items in games xD
Oh! Mushrooms! They should be on here! the possibilities! I love them!