Yeah, when done right, a good plot line is worth following - but what I dislike is the pace being dictated to me, I like my handheld games to go at my pace. Tanks are the worst - like by level 3 your in a tank, fighting other tanks, and as much as I like tanks and appreciate the ability to get in them and cause some trouble, well being stuck in a tank for a whole level is just dull. The annoying thing is that you start the level, run over and get in your tank, and you can't get out again until you've done all the objectives.
I'd love to see this sort of game go more free-roaming, I know they'll never make Battlefield work on a handheld, but having a little freedom to explore is vital in these games, and that's missing from BiA DS.
If like touch of the dead as well - completely linear to the point where you don't get to walk yourself. I'm not a freaking cripple, I have a thumb and a direction pad, I could easily move myself!. These games are being dumbed down too much, considering what the DS is capable of and it's age, well I'd like to see more freedom and maturity for once.