Honchkrow is only easy to deal with because everyone and their mother runs the MoxieKrow set. Never mind, I take that back. It's still hard to deal with: it's easier to deal with because of the predictability. Even then (with a predictable set that supposedly gives away efficiency), you pretty much need a Steel-type or a Physically Bulky Rock-type to cover it. I would definitely not complain if Honchkrow gets banned. With that simple Moxie set, Honch manages to seriously threaten every playstyle. And don't get me going on the Mixed set. Always manages to Lure Steelix / Rhydon / whatever in for 2HKO.
I've been torn on the issue of Lilligant. Its Hidden Power choice makes it harder to counter in some sense, but easier to counter in another. I guess Sawsbuck and Bouffalant are there as all-out counters, but really forcing someone to have those specific mons could mean ban-worthy as well so that's not a good example. Entei can deal with Lilli, and so can other special walls and other things depending on its HP. It's a lot more counter-able (not really a word I know) than Honchkrow. Oh, and Buck and Bouff are significantly harder to 'take advantage of,' unlike those slow Rock and Steel-types.
Gallade also deserves mention, I guess, but people need to realize this: if everyone runs the same Bulk Up set, don't expect it to be super effective. Swords Dance set is also pretty darn good and it plummets the weak responses that come in to wall Bulk Up Gallade. I feel that in general, you need the strength to overpower DP UU in order to overpower BW RU. Gallade was banned in DP UU so he does have the prerequisite--doesn't mean he's broken though. Argh, my words are being really unorganized, but the point is that while Gallade isn't broken, it certainly has the potential to be really good.
On the topic of weather, I haven't seen too many Sun and Rain teams, but they're annoyingly effective. I'm going to shy away from "oh it doesn't take skill" because admittedly I'm not super skilled either, but I'm sure that a lot of people believe Sun and Rain need some type of nerfing--I think I did make an argument of Uxie as a suspect because of her ability to make weather offense broken / borderline broken, but even I think that's some shady logic there. As for Hail, I don't think it's broken at all. It's all in the teambuilding. With Cryogonal and careful play, you're really not getting beat unless you're playing against a really really good hail team. Hail really needs a team built around, and it's nowhere near an auto-win.
TL;DR: Honch and Sun/Rain is the closest to needing a suspect vote, Lilligant is somewhere in the middle, Hail and Gallade is theoretically good but doesn't work as well in practice.