I'm a floating voter and will react to local considerations when casting a vote, but Lib Dem tends to be my default ground.
I voted for them in 2010 and 2015. During the coalition years, I accepted that as the minority partner they would have to make unpleasant concessions on their manifesto. I felt the rap they got over tuition fees was unfair- plenty of goverments in stronger positions have made u-turns. I felt that they were a moderating force on the Conservatives and doubt that softer policies like free school meals for R and KS1 or same sex marriage would have been passed without their influence.
I'm hoping that UKIP are finished. At the better end of their agenda, they've achieved their mission of Brexit. All that is left is the ugly xenophobic end. Without Farage, they look like they'll do a nice job of ripping themselves apart. Farage is astute enough to know that the ship will be sinking now.
Labour look to be in the long haul for bitter divisions like the Conservatives post 2007. At a local level, my "Labour" "lead" council are acting despicably, shutting down the city services, splashing out money on inane "street art" and stripping TAs of up to 25% of their salaries by dumping new conditions on them in a way that would make Jeremy Hunt wince.
Nationalist parties don't apply to my area, but referendum fatigue could hit the SNP in future elections. Also their success in 2015 could backfire in a way similar to the LDs in 2010.
And the Conservatives? I object to their agenda in education and health in particular.
The Lib Dems seem to have taken last year's drubbing fairly stoically- at least their lack of media attention has given them time to lick their wounds in private. When I hear Lib Dems, they seems to maintain sensible voices of reason. Also when my council was run by the Lib Dems and Conservatives, it seemed to run quite effectively.