If it's crap ... We'll tell you
Well, yes. Yes they can. But the real question is: will they? Mass Effect 2 was a brilliant game and is the best game I've ever played. It was NEARLY faultless and somehow made the original Mass Effect look mediocre. Now, Mass Effect 3 has the unfortunate task of trying to improve on a near-perfect game and the only way for people not to say "it's exactly the same as Mass Effect 2" is to make it 100% perfect. I will provide BioWare with a list of problems that I encountered with Mass Effect 2 in the hope that they fix them. Most of these problems are small but all of them together become quite large. Anyway, in no particular order, here they are:
1. The "skip conversation" button can also select a conversation option
To be honest, this really pissed me off. In Knights of the Old Republic, one of BioWare's earlier games, "A" was used to select conversation and also skip conversation. In Mass Effect they made "A" choose conversation and "X" skip conversation. At first, I thought BioWare had done something brilliant until I realised that "X" also selected conversation. I was baffled by this. Why would BioWare go out of their way to have two buttons when they it's basically the same as having one button? They should have had two, but have "X" ONLY skip conversation and "A" ONLY choose conversation. This would be a great change because if you screw up in conversation you can reload your nearest save and use "X" to quickly skip through dialogue that you've just heard and not be afraid to accidentally select the wrong conversation again. Also, if you have already played through the game enough times that you've basically memorised every line of dialogue in the game you should be able to skip through it quickly and easily.
2. Rearrangement of start menu
Not many people complained about this but for some reason BioWare decided to rearrange the start menu for Mass Effect 2. After playing through Mass Effect most gamers had automatically selected things from the start menu. Then BioWare decided to screw with them and rearrange everything so they would keep choosing the wrong thing. This was only a problem at first and most gamers got used to it but BioWare should leave it as it is. Please don't change it again.
3. Planet scanning
Planet scanning got a lot of harsh criticism and is considered to really hurt the game and be its biggest problem. I think this is a bit too harsh. There are some things BioWare can do to make it a lot better but I think they will just scrap it and try something else. But if they do want to keep it, I have a few suggestions. Firstly, it needs to be a lot faster. Planet scanning is unbelievably slow and needs to be sped up a lot to be more bearable. Secondly, the amount of each resource necessary to create something should be a lot smaller so you don't have to scan planets for hours. Finally, I heard a suggestion from Angry Joe that I think is a great idea and all credit goes to him. He suggested a sort of fog or cloud that covered the planets that disappear when you scan an area so that you know where you have already scanned.
4. Configuration problems
There are a few very minor configuration issues with Mass Effect 2. The most annoying of which is that the same button that tells a party member to use a power also orders them to move to a location. This is annoying because if the crosshairs aren't perfectly positioned then you will send your party member to run straight towards the enemy where they will almost certainly die.
This isn't technically a problem with Mass Effect 2 but more of an omission. I thought during the original Mass Effect that co-op would have been really easy to do and I was quite surprised that it wasn't in Mass Effect 2 either. The second player could just control one of the two party members that accompanies Shepard. This does not have to be how co-op works but that's how I would do it. The only issue with this is that BioWare may want to put this in because the fans really want it but it ends up quite bad. I would prefer that BioWare not bother with co-op at all if it doesn't work.
That's pretty much it. Those are my main issues that, if fixed, will make Mass Effect 3 a perfect game, assuming they keep the great characters, interesting universe, amazing story, incredible dialogue, important/difficult choices and everything else that made Mass Effect and Mass Effect 2 great.