I would say the opposite, do not consider your opinion. However that said I agree about the buttons but I tend to play many games which don't have button problems but clearly there are less on the Vita and sometimes it does cause problems or makes games annoying to control. I'd say the majority are fine though. Are any games unplayable? That seems unfair because you do adapt to using either the front or rear touch pad but it depends on the game. Some games are better set up for remote play and some even have a Vita friendly setup option. The lag can actually be very low and un-noticable. I've just played super stardust ultra with zero problems. My ps4 is connected via ethernet cable and my router is modern using the fastest wifi speeds to the Vita that it will handle. I am only using the Vita around the house. Analogue sticks are fine. Who cares if it's using two consoles, surely that's the whole point. The main tv is tied up doing something else so what does it matter if the ps4 is being utilised by the Vita for remote play. I don't get that point at all.
Considering you can play your entire ps4 library on Vita with admittedly some issues with controls for some games, plus the Vita library and a whole load of apps for web browsing, media playback, email etc the versatility and range of games you can play on it is pretty amazing. It will be a long time if ever before the Switch can even approach this level of functionality and range of games.