I'd say worn down by persistent and recurring bugs, glacial development, continously dropped gameplay content, totally imaginary development progress roadmaps and server performance not fit for purpose are the factors that wear most folk down over time. Star Citizen has it's moments, or it can have...it can also be an enjoyable romp when the gods of t'interweb and broken software occasionally work in your favour...or leave you alone long enough to get on with just playing.
Those moments in Star Citizen are very rare at the minute...we all know about the massive desync issues and dropped server tick rates effecting anything that you do in game from entering or leaving a ship, travelling in elevators, mining, trading, all the way down to PvE or PvP combat. For regular players, we don't need to be reminded of it or see Twitch clips from some random streamer crying into his dropped audience spreadsheet over it...we suffer those every time we log in...From the release of 3.13, it's certainly been the worst I've ever seen it and I've been a regular player for a long time...I almost preferred the 30k's to how it is now...
Now...it's back to waiting for the new content patch which will bring in more bugs, offer no improvement on the desync issues and will almost cripple the servers for a week or so while all the Twitch streamers, occasional newbies or play for a week every patch backers pop back in to gawp at clouds