Harrier TGI is somewhat boring and predictable to play with (but I'm happy if it gets the job done).
Really I dislike kits that are played badly: e.g. Geth Jug and Korgan Warlord Sentinel (you'd be surprised how badly these popular kits are played!). That said, those that are played well really stick out to me - well done, people! (I couldn't hope to play them half as well as those people).
Anything else is fine by me, as long as they're played well. And most things are. The only things I could really pick on are the two I mentioned above.
Another point is the volus. They generally get a bad rep, which is unfortunate for those out there who actually play them well (no matter how few and far-between).
Stereotypes will be stereotypes. At the end of the day; all I hope to see is that people make an effort - even if they don't quite pull-off the kit they're playing. Enthusiasm wins me over any day of the week

On that note; I'm grateful to play with anyone (just as long as they aren't stingy on their equipment).