I think it's great the direction partypoker are going in terms of generous promotions, giveaways and increasingly more tournaments on offer (as well as more runners). Despite this, I still prefer to play on a poker site that hates it's customers, spits in their face and laughs. It's basically Stockholm syndrome!
I cannot believe that the software has changed so slowly and for the worse since I started playing on there in 2004. There have been the occasional improvements but it's just polishing a turd at this point. Quite obviously a complete revamp of the lobby and design of the tables and what not is bloody expensive but this is a very large business.
I would start by creating proper filters for tournament lobbies. It's an absolute monstrosity of a clusterfuck at the moment. It's kind of somewhere between clunky and modern. Either go super classic or super modern. I would go as far as saying the attatched image from partypoker lobby in 2004 is better.

My second point I would like to make and I am not confident that others are in the same boat as me here, but the huge starting stacks at the start of tournaments has become overly gimmicky and off putting. I used to love playing tournaments and seeing 62525 chips in front of me and know that I am either in the money or very deep in the tournament. Not only have you increased starting stacks in tournaments which I think is bad for moral, you've made them dis-proportionally large across multiple buyins. Uppercut has 30k (which is the lowest starting stack you seem to have now), some sunday majors have 50k, some have 100k. These $20 phase feeders start with 50k with the 200 starting with 500k. I am pretty sure I've played in tournaments with 1m starting stacks too. For the playing experience this is bad. Stars have it right here with 5k starting in their "reds" and 3k in some of their bowl comps. Some majors like the warmup, milly etc have 10k. 25k and 50k starting stacks seem to be restricted for 1ks in the week and then twice a year when scoop/wcoop comes along. Feels very prestigious this way. There is a monster stack series on party this month so I just decided to check the starting stacks. I click on 3 tournaments and I get 30k/variable, 60k and 80k starting stacks. I think my point is clear.